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class="item-toggle-none"></span><a href="#sec-well-known-symbols" title="Well-Known Symbols"><span class="secnum">6.1.5.1</span> Well-Known Symbols</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-intrinsic-matcher" title="Misc"><span class="secnum">7</span> Misc</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-create-match-record" title="CreateMatchRecord ( matched [ , value ] )"><span class="secnum">7.1</span> <ins>CreateMatchRecord ( <var>matched</var> [ , <var>value</var> ] )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-create-match-result" title="CreateMatchResultObject ( matched [ , value ] )"><span class="secnum">7.2</span> <ins>CreateMatchResultObject ( <var>matched</var> [ , <var>value</var> ] )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-constructor-instance" title="MatchConstructorInstance ( value, target [ , intrinsicName ] )"><span class="secnum">7.3</span> <ins>MatchConstructorInstance ( <var>value</var>, <var>target</var> [ , <var>intrinsicName</var> ] )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-ecmascript-language-expressions" title="ECMAScript Language: Expressions"><span class="secnum">13</span> ECMAScript Language: Expressions</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-match-expression" title="Match Expression"><span class="secnum">13.5</span> <ins>Match Expression</ins></a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-match-expression-syntax" title="Syntax"><span class="secnum">13.5.1</span> Syntax</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.5.2</span> <ins>SS: Early Errors</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-runtime-semantics" title="Runtime Semantics: Evaluation"><span class="secnum">13.5.3</span> <ins>RS: Evaluation</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-clauses-evaluation" title="Runtime Semantics: MatchClausesEvaluation"><span class="secnum">13.5.4</span> RS: MatchClausesEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-clause-evaluation" title="Runtime Semantics: MatchClauseEvaluation"><span class="secnum">13.5.5</span> RS: MatchClauseEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-pattern-matches" title="Runtime Semantics: MatchPatternMatches"><span class="secnum">13.5.6</span> RS: MatchPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-combined-match-pattern-matches" title="Runtime Semantics: CombinedMatchPatternMatches"><span class="secnum">13.5.7</span> RS: CombinedMatchPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-interpolation-pattern-matches" title="Runtime Semantics: InterpolationPatternMatches"><span class="secnum">13.5.8</span> RS: InterpolationPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-near-literal-match-pattern-matches" title="Runtime Semantics: NearLiteralMatchPatternMatches"><span class="secnum">13.5.9</span> RS: NearLiteralMatchPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-destructuring-match-pattern-matches" title="Runtime Semantics: DestructuringMatchPatternMatches"><span class="secnum">13.5.10</span> RS: DestructuringMatchPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-property-evaluation" title="Runtime Semantics: ObjectMatchPatternPropertyEvaluation"><span class="secnum">13.5.11</span> RS: ObjectMatchPatternPropertyEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-rest-property-evaluation" title="Runtime Semantics: MatchRestPropertyEvaluation"><span class="secnum">13.5.12</span> RS: MatchRestPropertyEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-element-evaluation" title="Runtime Semantics: MatchElementEvaluation"><span class="secnum">13.5.13</span> RS: MatchElementEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-record" title="Match Records"><span class="secnum">13.5.14</span> <ins>Match Records</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-custom-matcher" title="InvokeCustomMatcher ( val, matchable )"><span class="secnum">13.5.15</span> <ins>InvokeCustomMatcher ( <var>val</var>, <var>matchable</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-regex-named-capture-group-binding" title="RegularExpressionNamedCaptureGroupBindingInitialization ( regexMatchResult )"><span class="secnum">13.5.16</span> <ins>RegularExpressionNamedCaptureGroupBindingInitialization ( <var>regexMatchResult</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-get-match-cache" title="GetMatchCache ( cacheGroup, object )"><span class="secnum">13.5.17</span> <ins>GetMatchCache ( <var>cacheGroup</var>, <var>object</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-cached-has-property" title="MatchCachedHasProperty ( cacheGroup, object, propertyName )"><span class="secnum">13.5.18</span> <ins>MatchCachedHasProperty ( <var>cacheGroup</var>, <var>object</var>, <var>propertyName</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-cached-get" title="MatchCachedGet ( cacheGroup, object, propertyName )"><span class="secnum">13.5.19</span> <ins>MatchCachedGet ( <var>cacheGroup</var>, <var>object</var>, <var>propertyName</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-cached-is-iterable" title="MatchCachedIsIterable ( cacheGroup, object )"><span class="secnum">13.5.20</span> <ins>MatchCachedIsIterable ( <var>cacheGroup</var>, <var>object</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-cached-get-iterator" title="MatchCachedGetIterator ( cacheGroup, object )"><span class="secnum">13.5.21</span> <ins>MatchCachedGetIterator ( <var>cacheGroup</var>, <var>object</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-cached-iterator-step" title="MatchCachedIteratorStep ( cacheGroup, iterator )"><span class="secnum">13.5.22</span> <ins>MatchCachedIteratorStep ( <var>cacheGroup</var>, <var>iterator</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-cached-get-iterator-nth-item" title="MatchCachedGetIteratorNthItem ( cacheGroup, iterator, n )"><span class="secnum">13.5.23</span> <ins>MatchCachedGetIteratorNthItem ( <var>cacheGroup</var>, <var>iterator</var>, <var>n</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-iterator-length-match" title="MatchIteratorLengthMatch ( cacheGroup, matchable, lastIndex )"><span class="secnum">13.5.24</span> <ins>MatchIteratorLengthMatch ( <var>cacheGroup</var>, <var>matchable</var>, <var>lastIndex</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-close-iterators" title="CloseIterators ( iterators )"><span class="secnum">13.5.25</span> <ins>CloseIterators ( <var>iterators</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-add-match-binding" title="AddMatchBinding ( name, value )"><span class="secnum">13.5.26</span> <ins>AddMatchBinding ( <var>name</var>, <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-relational-operators" title="Relational Operators"><span class="secnum">13.10</span> Relational Operators</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-relational-operators-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.10.1</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-fundamental-objects" title="Fundamental Objects"><span class="secnum">20</span> Fundamental Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-object-objects" title="Object Objects"><span class="secnum">20.1</span> Object Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-object-constructor" title="Properties of the Object Constructor"><span class="secnum">20.1.2</span> Properties of the Object Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-object-@@matcher" title="Object [ @@matcher ] ( value )"><span class="secnum">20.1.2.23</span> <ins>Object [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-function-objects" title="Function Objects"><span class="secnum">20.2</span> Function Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-function-constructor" title="Properties of the Function Constructor"><span class="secnum">20.2.2</span> Properties of the Function Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-function-@@matcher" title="Function [ @@matcher ] ( value )"><span class="secnum">20.2.2.3</span> <ins>Function [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-function-prototype-object" title="Properties of the Function Prototype Object"><span class="secnum">20.2.3</span> Properties of the Function Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-function-prototype-@@matcher" title="Function.prototype [ @@matcher ] ( value )"><span class="secnum">20.2.3.7</span> <ins>Function.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-boolean-objects" title="Boolean Objects"><span class="secnum">20.3</span> Boolean Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-boolean-constructor" title="Properties of the Boolean Constructor"><span class="secnum">20.3.2</span> Properties of the Boolean Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-boolean-@@matcher" title="Boolean [ @@matcher ] ( value )"><span class="secnum">20.3.2.2</span> <ins>Boolean [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-boolean-prototype-object" title="Properties of the Boolean Prototype Object"><span class="secnum">20.3.3</span> Properties of the Boolean Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-boolean-prototype-@@matcher" title="Boolean.prototype [ @@matcher ] ( value )"><span class="secnum">20.3.3.4</span> <ins>Boolean.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-symbol-objects" title="Symbol Objects"><span class="secnum">20.4</span> Symbol Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-symbol-constructor" title="Properties of the Symbol Constructor"><span class="secnum">20.4.2</span> Properties of the Symbol Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-symbol-@@matcher" title="Symbol [ @@matcher ] ( value )"><span class="secnum">20.4.2.17</span> <ins>Symbol [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-symbol-prototype-object" title="Properties of the Symbol Prototype Object"><span class="secnum">20.4.3</span> Properties of the Symbol Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-symbol-prototype-@@matcher" title="Symbol.prototype [ @@matcher ] ( value )"><span class="secnum">20.4.3.5</span> <ins>Symbol.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-error-objects" title="Error Objects"><span class="secnum">20.5</span> Error Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-error-constructor" title="Properties of the Error Constructor"><span class="secnum">20.5.2</span> Properties of the Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#error-@@matcher" title="Error [ @@matcher ] ( value )"><span class="secnum">20.5.2.2</span> <ins>Error [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-nativeerror-object-structure" title="NativeError Object Structure"><span class="secnum">20.5.6</span> <var>NativeError</var> Object Structure</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-nativeerror-constructors" title="Properties of the NativeError Constructors"><span class="secnum">20.5.6.2</span> Properties of the <var>NativeError</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#nativeerror-@@matcher" title="NativeError [ @@matcher ] ( value )"><span class="secnum">20.5.6.2.2</span> <ins><var>NativeError</var> [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-aggregate-error-objects" title="AggregateError Objects"><span class="secnum">20.5.7</span> AggregateError Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-aggregate-error-constructor" title="The AggregateError Constructor"><span class="secnum">20.5.7.1</span> The AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-aggregate-error" title="AggregateError ( errors, message [ , options ] )"><span class="secnum">20.5.7.1.1</span> AggregateError ( <var>errors</var>, <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-aggregate-error-constructor" title="Properties of the AggregateError Constructor"><span class="secnum">20.5.7.2</span> Properties of the AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#aggregate-error-@@matcher" title="AggregateError [ @@matcher ] ( value )"><span class="secnum">20.5.7.2.2</span> <ins>AggregateError [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-numbers-and-dates" title="Numbers and Dates"><span class="secnum">21</span> Numbers and Dates</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-number-objects" title="Number Objects"><span class="secnum">21.1</span> Number Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-number-constructor" title="Properties of the Number Constructor"><span class="secnum">21.1.2</span> Properties of the Number Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-number-@@matcher" title="Number [ @@matcher ] ( value )"><span class="secnum">21.1.2.16</span> <ins>Number [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-number-prototype-object" title="Properties of the Number Prototype Object"><span class="secnum">21.1.3</span> Properties of the Number Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-number-prototype-@@matcher" title="Number.prototype [ @@matcher ] ( value )"><span class="secnum">21.1.3.8</span> <ins>Number.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-bigint-objects" title="BigInt Objects"><span class="secnum">21.2</span> BigInt Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-bigint-constructor" title="Properties of the BigInt Constructor"><span class="secnum">21.2.2</span> Properties of the BigInt Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-bigint-@@matcher" title="BigInt [ @@matcher ] ( value )"><span class="secnum">21.2.2.4</span> <ins>BigInt [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-bigint-prototype-object" title="Properties of the BigInt Prototype Object"><span class="secnum">21.2.3</span> Properties of the BigInt Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-bigint-prototype-@@matcher" title="BigInt.prototype [ @@matcher ] ( value )"><span class="secnum">21.2.3.6</span> <ins>BigInt.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-date-objects" title="Date Objects"><span class="secnum">21.4</span> Date Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-date-constructor" title="Properties of the Date Constructor"><span class="secnum">21.4.3</span> Properties of the Date Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#date-@@matcher" title="Date [ @@matcher ] ( value )"><span class="secnum">21.4.3.5</span> <ins>Date [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-text-processing" title="Text Processing"><span class="secnum">22</span> Text Processing</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-string-objects" title="String Objects"><span class="secnum">22.1</span> String Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-string-constructor" title="Properties of the String Constructor"><span class="secnum">22.1.2</span> Properties of the String Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#string-@@matcher" title="String [ @@matcher ] ( value )"><span class="secnum">22.1.2.5</span> <ins>String [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-string-prototype-object" title="Properties of the String Prototype Object"><span class="secnum">22.1.3</span> Properties of the String Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-string-prototype-@@matcher" title="String.prototype [ @@matcher ] ( value )"><span class="secnum">22.1.3.35</span> <ins>String.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-regexp-regular-expression-objects" title="RegExp (Regular Expression) Objects"><span class="secnum">22.2</span> RegExp (Regular Expression) Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-regexp-constructor" title="Properties of the RegExp Constructor"><span class="secnum">22.2.4</span> Properties of the RegExp Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#regexp-@@matcher" title="RegExp [ @@matcher ] ( value )"><span class="secnum">22.2.4.1</span> <ins>RegExp [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-regexp-prototype-object" title="Properties of the RegExp Prototype Object"><span class="secnum">22.2.5</span> Properties of the RegExp Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#regexp-prototype-@@matcher" title="RegExp.prototype [ @@matcher ] ( value )"><span class="secnum">22.2.5.10</span> <ins>RegExp.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-indexed-collections" title="Indexed Collections"><span class="secnum">23</span> Indexed Collections</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-array-objects" title="Array Objects"><span class="secnum">23.1</span> Array Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-array-constructor" title="Properties of the Array Constructor"><span class="secnum">23.1.1</span> Properties of the Array Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#array-@@matcher" title="Array [ @@matcher ] ( value )"><span class="secnum">23.1.1.6</span> <ins>Array [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-typedarray-objects" title="TypedArray Objects"><span class="secnum">23.2</span> TypedArray Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-typedarray-constructors" title="Properties of the TypedArray Constructors"><span class="secnum">23.2.6</span> Properties of the <var>TypedArray</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#typedarray-@@matcher" title="TypedArray [ @@matcher ] ( value )"><span class="secnum">23.2.6.3</span> <ins><var>TypedArray</var> [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-keyed-collections" title="Keyed Collections"><span class="secnum">24</span> Keyed Collections</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-map-objects" title="Map Objects"><span class="secnum">24.1</span> Map Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-map-constructor" title="Properties of the Map Constructor"><span class="secnum">24.1.2</span> Properties of the Map Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#map-@@matcher" title="Map [ @@matcher ] ( value )"><span class="secnum">24.1.2.3</span> <ins>Map [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-set-objects" title="Set Objects"><span class="secnum">24.2</span> Set Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-set-constructor" title="Properties of the Set Constructor"><span class="secnum">24.2.2</span> Properties of the Set Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#set-@@matcher" title="Set [ @@matcher ] ( value )"><span class="secnum">24.2.2.3</span> <ins>Set [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-weakmap-objects" title="WeakMap Objects"><span class="secnum">24.3</span> WeakMap Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-weakmap-constructor" title="Properties of the WeakMap Constructor"><span class="secnum">24.3.2</span> Properties of the WeakMap Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#weakmap-@@matcher" title="WeakMap [ @@matcher ] ( value )"><span class="secnum">24.3.2.2</span> <ins>WeakMap [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-weakset-objects" title="WeakSet Objects"><span class="secnum">24.4</span> WeakSet Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-weakset-constructor" title="Properties of the WeakSet Constructor"><span class="secnum">24.4.2</span> Properties of the WeakSet Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#weakset-@@matcher" title="WeakSet [ @@matcher ] ( value )"><span class="secnum">24.4.2.2</span> <ins>WeakSet [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-structured-data" title="Structured Data"><span class="secnum">25</span> Structured Data</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-arraybuffer-objects" title="ArrayBuffer Objects"><span class="secnum">25.1</span> ArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-arraybuffer-constructor" title="Properties of the ArrayBuffer Constructor"><span class="secnum">25.1.4</span> Properties of the ArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#arraybuffer-@@matcher" title="ArrayBuffer [ @@matcher ] ( value )"><span class="secnum">25.1.4.4</span> <ins>ArrayBuffer [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-sharedarraybuffer-objects" title="SharedArrayBuffer Objects"><span class="secnum">25.2</span> SharedArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-sharedarraybuffer-constructor" title="Properties of the SharedArrayBuffer Constructor"><span class="secnum">25.2.3</span> Properties of the SharedArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sharedarraybuffer-@@matcher" title="SharedArrayBuffer [ @@matcher ] ( value )"><span class="secnum">25.2.3.3</span> <ins>SharedArrayBuffer [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-dataview-objects" title="DataView Objects"><span class="secnum">25.3</span> DataView Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-dataview-constructor" title="Properties of the DataView Constructor"><span class="secnum">25.3.3</span> Properties of the DataView Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#dataview-@@matcher" title="DataView [ @@matcher ] ( value )"><span class="secnum">25.3.3.2</span> <ins>DataView [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-managing-memory" title="Managing Memory"><span class="secnum">26</span> Managing Memory</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-weak-ref-objects" title="WeakRef Objects"><span class="secnum">26.1</span> WeakRef Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-weak-ref-constructor" title="Properties of the WeakRef Constructor"><span class="secnum">26.1.2</span> Properties of the WeakRef Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#weak-ref-@@matcher" title="WeakRef [ @@matcher ] ( value )"><span class="secnum">26.1.2.2</span> <ins>WeakRef [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-finalization-registry-objects" title="FinalizationRegistry Objects"><span class="secnum">26.2</span> FinalizationRegistry Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-finalization-registry-constructor" title="Properties of the FinalizationRegistry Constructor"><span class="secnum">26.2.2</span> Properties of the FinalizationRegistry Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#finalization-registry-@@matcher" title="FinalizationRegistry [ @@matcher ] ( value )"><span class="secnum">26.2.2.2</span> <ins>FinalizationRegistry [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-control-abstraction-objects" title="Control Abstraction Objects"><span class="secnum">27</span> Control Abstraction Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-promise-objects" title="Promise Objects"><span class="secnum">27.2</span> Promise Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-promise-constructor" title="Properties of the Promise Constructor"><span class="secnum">27.2.4</span> Properties of the Promise Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#promise-@@matcher" title="Promise [ @@matcher ] ( value )"><span class="secnum">27.2.4.9</span> <ins>Promise [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-todo" title="TODO"><span class="secnum">1000</span> TODO</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#todo-constructors" title="Confirm we do not want matchers for these constructors"><span class="secnum">1000.1</span> Confirm we do not want matchers for these constructors</a></li><li><span class="item-toggle-none"></span><a href="#todo-object-instances" title="Should we add builtin matchers on the prototype for relevant class instances, so they do something useful?"><span class="secnum">1000.2</span> Should we add builtin matchers on the prototype for relevant class instances, so they do something useful?</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">A</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Stage 1 Draft / September 5, 2023</h1><h1 class="title">Pattern Matching</h1>
+    </svg></div><div id="menu-spacer" class="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins</div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-ecmascript-data-types-and-values" title="ECMAScript Data Types and Values"><span class="secnum">6</span> ECMAScript Data Types and Values</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-ecmascript-language-types" title="ECMAScript Language Types"><span class="secnum">6.1</span> ECMAScript Language Types</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-ecmascript-language-types-symbol-type" title="The Symbol Type"><span class="secnum">6.1.5</span> The Symbol Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-well-known-symbols" title="Well-Known Symbols"><span class="secnum">6.1.5.1</span> Well-Known Symbols</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-intrinsic-matcher" title="Misc"><span class="secnum">7</span> Misc</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-create-match-record" title="CreateMatchRecord ( matched [ , value ] )"><span class="secnum">7.1</span> <ins>CreateMatchRecord ( <var>matched</var> [ , <var>value</var> ] )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-create-match-result" title="CreateMatchResultObject ( matched [ , value ] )"><span class="secnum">7.2</span> <ins>CreateMatchResultObject ( <var>matched</var> [ , <var>value</var> ] )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-constructor-instance" title="MatchConstructorInstance ( value, target [ , intrinsicName ] )"><span class="secnum">7.3</span> <ins>MatchConstructorInstance ( <var>value</var>, <var>target</var> [ , <var>intrinsicName</var> ] )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-ecmascript-language-expressions" title="ECMAScript Language: Expressions"><span class="secnum">13</span> ECMAScript Language: Expressions</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-match-expression" title="Match Expression"><span class="secnum">13.5</span> <ins>Match Expression</ins></a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-match-expression-syntax" title="Syntax"><span class="secnum">13.5.1</span> Syntax</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.5.2</span> <ins>SS: Early Errors</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-runtime-semantics" title="Runtime Semantics: Evaluation"><span class="secnum">13.5.3</span> <ins>RS: Evaluation</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-clauses-evaluation" title="Runtime Semantics: MatchClausesEvaluation"><span class="secnum">13.5.4</span> RS: MatchClausesEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-clause-evaluation" title="Runtime Semantics: MatchClauseEvaluation"><span class="secnum">13.5.5</span> RS: MatchClauseEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-pattern-matches" title="Runtime Semantics: MatchPatternMatches"><span class="secnum">13.5.6</span> RS: MatchPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-combined-match-pattern-matches" title="Runtime Semantics: CombinedMatchPatternMatches"><span class="secnum">13.5.7</span> RS: CombinedMatchPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-interpolation-pattern-matches" title="Runtime Semantics: InterpolationPatternMatches"><span class="secnum">13.5.8</span> RS: InterpolationPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-near-literal-match-pattern-matches" title="Runtime Semantics: NearLiteralMatchPatternMatches"><span class="secnum">13.5.9</span> RS: NearLiteralMatchPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-destructuring-match-pattern-matches" title="Runtime Semantics: DestructuringMatchPatternMatches"><span class="secnum">13.5.10</span> RS: DestructuringMatchPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-property-evaluation" title="Runtime Semantics: ObjectMatchPatternPropertyEvaluation"><span class="secnum">13.5.11</span> RS: ObjectMatchPatternPropertyEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-rest-property-evaluation" title="Runtime Semantics: MatchRestPropertyEvaluation"><span class="secnum">13.5.12</span> RS: MatchRestPropertyEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-element-evaluation" title="Runtime Semantics: MatchElementEvaluation"><span class="secnum">13.5.13</span> RS: MatchElementEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-record" title="Match Records"><span class="secnum">13.5.14</span> <ins>Match Records</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-custom-matcher" title="InvokeCustomMatcher ( val, matchable )"><span class="secnum">13.5.15</span> <ins>InvokeCustomMatcher ( <var>val</var>, <var>matchable</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-regex-named-capture-group-binding" title="RegularExpressionNamedCaptureGroupBindingInitialization ( regexMatchResult )"><span class="secnum">13.5.16</span> <ins>RegularExpressionNamedCaptureGroupBindingInitialization ( <var>regexMatchResult</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-get-match-cache" title="GetMatchCache ( cacheGroup, object )"><span class="secnum">13.5.17</span> <ins>GetMatchCache ( <var>cacheGroup</var>, <var>object</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-cached-has-property" title="MatchCachedHasProperty ( cacheGroup, object, propertyName )"><span class="secnum">13.5.18</span> <ins>MatchCachedHasProperty ( <var>cacheGroup</var>, <var>object</var>, <var>propertyName</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-cached-get" title="MatchCachedGet ( cacheGroup, object, propertyName )"><span class="secnum">13.5.19</span> <ins>MatchCachedGet ( <var>cacheGroup</var>, <var>object</var>, <var>propertyName</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-cached-is-iterable" title="MatchCachedIsIterable ( cacheGroup, object )"><span class="secnum">13.5.20</span> <ins>MatchCachedIsIterable ( <var>cacheGroup</var>, <var>object</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-cached-get-iterator" title="MatchCachedGetIterator ( cacheGroup, object )"><span class="secnum">13.5.21</span> <ins>MatchCachedGetIterator ( <var>cacheGroup</var>, <var>object</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-cached-iterator-step" title="MatchCachedIteratorStep ( cacheGroup, iterator )"><span class="secnum">13.5.22</span> <ins>MatchCachedIteratorStep ( <var>cacheGroup</var>, <var>iterator</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-cached-get-iterator-nth-item" title="MatchCachedGetIteratorNthItem ( cacheGroup, iterator, n )"><span class="secnum">13.5.23</span> <ins>MatchCachedGetIteratorNthItem ( <var>cacheGroup</var>, <var>iterator</var>, <var>n</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-match-iterator-length-match" title="MatchIteratorLengthMatch ( cacheGroup, matchable, lastIndex )"><span class="secnum">13.5.24</span> <ins>MatchIteratorLengthMatch ( <var>cacheGroup</var>, <var>matchable</var>, <var>lastIndex</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-close-iterators" title="CloseIterators ( iterators )"><span class="secnum">13.5.25</span> <ins>CloseIterators ( <var>iterators</var> )</ins></a></li><li><span class="item-toggle-none"></span><a href="#sec-add-match-binding" title="AddMatchBinding ( name, value )"><span class="secnum">13.5.26</span> <ins>AddMatchBinding ( <var>name</var>, <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-relational-operators" title="Relational Operators"><span class="secnum">13.10</span> Relational Operators</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-relational-operators-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.10.1</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-fundamental-objects" title="Fundamental Objects"><span class="secnum">20</span> Fundamental Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-object-objects" title="Object Objects"><span class="secnum">20.1</span> Object Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-object-constructor" title="Properties of the Object Constructor"><span class="secnum">20.1.2</span> Properties of the Object Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-object-@@matcher" title="Object [ @@matcher ] ( value )"><span class="secnum">20.1.2.23</span> <ins>Object [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-function-objects" title="Function Objects"><span class="secnum">20.2</span> Function Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-function-constructor" title="Properties of the Function Constructor"><span class="secnum">20.2.2</span> Properties of the Function Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-function-@@matcher" title="Function [ @@matcher ] ( value )"><span class="secnum">20.2.2.3</span> <ins>Function [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-function-prototype-object" title="Properties of the Function Prototype Object"><span class="secnum">20.2.3</span> Properties of the Function Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-function-prototype-@@matcher" title="Function.prototype [ @@matcher ] ( value )"><span class="secnum">20.2.3.7</span> <ins>Function.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-boolean-objects" title="Boolean Objects"><span class="secnum">20.3</span> Boolean Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-boolean-constructor" title="Properties of the Boolean Constructor"><span class="secnum">20.3.2</span> Properties of the Boolean Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-boolean-@@matcher" title="Boolean [ @@matcher ] ( value )"><span class="secnum">20.3.2.2</span> <ins>Boolean [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-boolean-prototype-object" title="Properties of the Boolean Prototype Object"><span class="secnum">20.3.3</span> Properties of the Boolean Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-boolean-prototype-@@matcher" title="Boolean.prototype [ @@matcher ] ( value )"><span class="secnum">20.3.3.4</span> <ins>Boolean.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-symbol-objects" title="Symbol Objects"><span class="secnum">20.4</span> Symbol Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-symbol-constructor" title="Properties of the Symbol Constructor"><span class="secnum">20.4.2</span> Properties of the Symbol Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-symbol-@@matcher" title="Symbol [ @@matcher ] ( value )"><span class="secnum">20.4.2.17</span> <ins>Symbol [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-symbol-prototype-object" title="Properties of the Symbol Prototype Object"><span class="secnum">20.4.3</span> Properties of the Symbol Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-symbol-prototype-@@matcher" title="Symbol.prototype [ @@matcher ] ( value )"><span class="secnum">20.4.3.5</span> <ins>Symbol.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-error-objects" title="Error Objects"><span class="secnum">20.5</span> Error Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-error-constructor" title="Properties of the Error Constructor"><span class="secnum">20.5.2</span> Properties of the Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#error-@@matcher" title="Error [ @@matcher ] ( value )"><span class="secnum">20.5.2.2</span> <ins>Error [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-nativeerror-object-structure" title="NativeError Object Structure"><span class="secnum">20.5.6</span> <var>NativeError</var> Object Structure</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-nativeerror-constructors" title="Properties of the NativeError Constructors"><span class="secnum">20.5.6.2</span> Properties of the <var>NativeError</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#nativeerror-@@matcher" title="NativeError [ @@matcher ] ( value )"><span class="secnum">20.5.6.2.2</span> <ins><var>NativeError</var> [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-aggregate-error-objects" title="AggregateError Objects"><span class="secnum">20.5.7</span> AggregateError Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-aggregate-error-constructor" title="The AggregateError Constructor"><span class="secnum">20.5.7.1</span> The AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-aggregate-error" title="AggregateError ( errors, message [ , options ] )"><span class="secnum">20.5.7.1.1</span> AggregateError ( <var>errors</var>, <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-aggregate-error-constructor" title="Properties of the AggregateError Constructor"><span class="secnum">20.5.7.2</span> Properties of the AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#aggregate-error-@@matcher" title="AggregateError [ @@matcher ] ( value )"><span class="secnum">20.5.7.2.2</span> <ins>AggregateError [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-numbers-and-dates" title="Numbers and Dates"><span class="secnum">21</span> Numbers and Dates</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-number-objects" title="Number Objects"><span class="secnum">21.1</span> Number Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-number-constructor" title="Properties of the Number Constructor"><span class="secnum">21.1.2</span> Properties of the Number Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-number-@@matcher" title="Number [ @@matcher ] ( value )"><span class="secnum">21.1.2.16</span> <ins>Number [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-number-prototype-object" title="Properties of the Number Prototype Object"><span class="secnum">21.1.3</span> Properties of the Number Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-number-prototype-@@matcher" title="Number.prototype [ @@matcher ] ( value )"><span class="secnum">21.1.3.8</span> <ins>Number.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-bigint-objects" title="BigInt Objects"><span class="secnum">21.2</span> BigInt Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-bigint-constructor" title="Properties of the BigInt Constructor"><span class="secnum">21.2.2</span> Properties of the BigInt Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-bigint-@@matcher" title="BigInt [ @@matcher ] ( value )"><span class="secnum">21.2.2.4</span> <ins>BigInt [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-bigint-prototype-object" title="Properties of the BigInt Prototype Object"><span class="secnum">21.2.3</span> Properties of the BigInt Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-bigint-prototype-@@matcher" title="BigInt.prototype [ @@matcher ] ( value )"><span class="secnum">21.2.3.6</span> <ins>BigInt.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-date-objects" title="Date Objects"><span class="secnum">21.4</span> Date Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-date-constructor" title="Properties of the Date Constructor"><span class="secnum">21.4.3</span> Properties of the Date Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#date-@@matcher" title="Date [ @@matcher ] ( value )"><span class="secnum">21.4.3.5</span> <ins>Date [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-text-processing" title="Text Processing"><span class="secnum">22</span> Text Processing</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-string-objects" title="String Objects"><span class="secnum">22.1</span> String Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-string-constructor" title="Properties of the String Constructor"><span class="secnum">22.1.2</span> Properties of the String Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#string-@@matcher" title="String [ @@matcher ] ( value )"><span class="secnum">22.1.2.5</span> <ins>String [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-string-prototype-object" title="Properties of the String Prototype Object"><span class="secnum">22.1.3</span> Properties of the String Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-string-prototype-@@matcher" title="String.prototype [ @@matcher ] ( value )"><span class="secnum">22.1.3.35</span> <ins>String.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-regexp-regular-expression-objects" title="RegExp (Regular Expression) Objects"><span class="secnum">22.2</span> RegExp (Regular Expression) Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-regexp-constructor" title="Properties of the RegExp Constructor"><span class="secnum">22.2.4</span> Properties of the RegExp Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#regexp-@@matcher" title="RegExp [ @@matcher ] ( value )"><span class="secnum">22.2.4.1</span> <ins>RegExp [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-regexp-prototype-object" title="Properties of the RegExp Prototype Object"><span class="secnum">22.2.5</span> Properties of the RegExp Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#regexp-prototype-@@matcher" title="RegExp.prototype [ @@matcher ] ( value )"><span class="secnum">22.2.5.10</span> <ins>RegExp.prototype [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-indexed-collections" title="Indexed Collections"><span class="secnum">23</span> Indexed Collections</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-array-objects" title="Array Objects"><span class="secnum">23.1</span> Array Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-array-constructor" title="Properties of the Array Constructor"><span class="secnum">23.1.1</span> Properties of the Array Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#array-@@matcher" title="Array [ @@matcher ] ( value )"><span class="secnum">23.1.1.6</span> <ins>Array [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-typedarray-objects" title="TypedArray Objects"><span class="secnum">23.2</span> TypedArray Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-typedarray-constructors" title="Properties of the TypedArray Constructors"><span class="secnum">23.2.6</span> Properties of the <var>TypedArray</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#typedarray-@@matcher" title="TypedArray [ @@matcher ] ( value )"><span class="secnum">23.2.6.3</span> <ins><var>TypedArray</var> [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-keyed-collections" title="Keyed Collections"><span class="secnum">24</span> Keyed Collections</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-map-objects" title="Map Objects"><span class="secnum">24.1</span> Map Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-map-constructor" title="Properties of the Map Constructor"><span class="secnum">24.1.2</span> Properties of the Map Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#map-@@matcher" title="Map [ @@matcher ] ( value )"><span class="secnum">24.1.2.3</span> <ins>Map [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-set-objects" title="Set Objects"><span class="secnum">24.2</span> Set Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-set-constructor" title="Properties of the Set Constructor"><span class="secnum">24.2.2</span> Properties of the Set Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#set-@@matcher" title="Set [ @@matcher ] ( value )"><span class="secnum">24.2.2.3</span> <ins>Set [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-weakmap-objects" title="WeakMap Objects"><span class="secnum">24.3</span> WeakMap Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-weakmap-constructor" title="Properties of the WeakMap Constructor"><span class="secnum">24.3.2</span> Properties of the WeakMap Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#weakmap-@@matcher" title="WeakMap [ @@matcher ] ( value )"><span class="secnum">24.3.2.2</span> <ins>WeakMap [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-weakset-objects" title="WeakSet Objects"><span class="secnum">24.4</span> WeakSet Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-weakset-constructor" title="Properties of the WeakSet Constructor"><span class="secnum">24.4.2</span> Properties of the WeakSet Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#weakset-@@matcher" title="WeakSet [ @@matcher ] ( value )"><span class="secnum">24.4.2.2</span> <ins>WeakSet [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-structured-data" title="Structured Data"><span class="secnum">25</span> Structured Data</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-arraybuffer-objects" title="ArrayBuffer Objects"><span class="secnum">25.1</span> ArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-arraybuffer-constructor" title="Properties of the ArrayBuffer Constructor"><span class="secnum">25.1.4</span> Properties of the ArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#arraybuffer-@@matcher" title="ArrayBuffer [ @@matcher ] ( value )"><span class="secnum">25.1.4.4</span> <ins>ArrayBuffer [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-sharedarraybuffer-objects" title="SharedArrayBuffer Objects"><span class="secnum">25.2</span> SharedArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-sharedarraybuffer-constructor" title="Properties of the SharedArrayBuffer Constructor"><span class="secnum">25.2.3</span> Properties of the SharedArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sharedarraybuffer-@@matcher" title="SharedArrayBuffer [ @@matcher ] ( value )"><span class="secnum">25.2.3.3</span> <ins>SharedArrayBuffer [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-dataview-objects" title="DataView Objects"><span class="secnum">25.3</span> DataView Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-dataview-constructor" title="Properties of the DataView Constructor"><span class="secnum">25.3.3</span> Properties of the DataView Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#dataview-@@matcher" title="DataView [ @@matcher ] ( value )"><span class="secnum">25.3.3.2</span> <ins>DataView [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-managing-memory" title="Managing Memory"><span class="secnum">26</span> Managing Memory</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-weak-ref-objects" title="WeakRef Objects"><span class="secnum">26.1</span> WeakRef Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-weak-ref-constructor" title="Properties of the WeakRef Constructor"><span class="secnum">26.1.2</span> Properties of the WeakRef Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#weak-ref-@@matcher" title="WeakRef [ @@matcher ] ( value )"><span class="secnum">26.1.2.2</span> <ins>WeakRef [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-finalization-registry-objects" title="FinalizationRegistry Objects"><span class="secnum">26.2</span> FinalizationRegistry Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-finalization-registry-constructor" title="Properties of the FinalizationRegistry Constructor"><span class="secnum">26.2.2</span> Properties of the FinalizationRegistry Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#finalization-registry-@@matcher" title="FinalizationRegistry [ @@matcher ] ( value )"><span class="secnum">26.2.2.2</span> <ins>FinalizationRegistry [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-control-abstraction-objects" title="Control Abstraction Objects"><span class="secnum">27</span> Control Abstraction Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-promise-objects" title="Promise Objects"><span class="secnum">27.2</span> Promise Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-promise-constructor" title="Properties of the Promise Constructor"><span class="secnum">27.2.4</span> Properties of the Promise Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#promise-@@matcher" title="Promise [ @@matcher ] ( value )"><span class="secnum">27.2.4.9</span> <ins>Promise [ @@matcher ] ( <var>value</var> )</ins></a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-todo" title="TODO"><span class="secnum">1000</span> TODO</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#todo-constructors" title="Confirm we do not want matchers for these constructors"><span class="secnum">1000.1</span> Confirm we do not want matchers for these constructors</a></li><li><span class="item-toggle-none"></span><a href="#todo-object-instances" title="Should we add builtin matchers on the prototype for relevant class instances, so they do something useful?"><span class="secnum">1000.2</span> Should we add builtin matchers on the prototype for relevant class instances, so they do something useful?</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">A</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Stage 1 Draft / September 6, 2023</h1><h1 class="title">Pattern Matching</h1>
 
 <emu-clause id="sec-ecmascript-data-types-and-values" aoid="Type" number="6">
   <h1><span class="secnum">6</span> ECMAScript Data Types and Values</h1>