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Return the prototype of a provided object.
To use in Observable,
getPrototypeOf = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-get-prototype-of@umd/browser.js' )To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var getPrototypeOf = require( 'path/to/vendor/umd/utils-get-prototype-of/index.js' )To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/utils-get-prototype-of@umd/browser.js"></script>If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.getPrototypeOf;
})();
</script>Returns the prototype of an input value.
var proto = getPrototypeOf( {} );
// returns {}-
In contrast to the native
Object.getPrototypeOf, this function does not throw when providednullorundefined. Instead, similar to when provided any value with no inherited properties, the function returnsnull.var proto = getPrototypeOf( Object.create( null ) ); // returns null proto = getPrototypeOf( null ); // returns null proto = getPrototypeOf( void 0 ); // returns null
-
Value arguments other than
nullorundefinedare coerced toobjects.var proto = getPrototypeOf( 'beep' ); // returns String.prototype proto = getPrototypeOf( 5 ); // returns Number.prototype
This behavior matches ES6/ES2015 native
Object.getPrototypeOfbehavior. In ES5, the nativeObject.getPrototypeOfthrows when provided non-object values.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/utils-get-prototype-of@umd/browser.js"></script>
<script type="text/javascript">
(function () {
var proto = getPrototypeOf( 'beep' );
// returns String.prototype
proto = getPrototypeOf( 5 );
// returns Number.prototype
proto = getPrototypeOf( true );
// returns Boolean.prototype
proto = getPrototypeOf( null );
// returns null
proto = getPrototypeOf( void 0 );
// returns null
proto = getPrototypeOf( [] );
// returns Array.prototype
proto = getPrototypeOf( {} );
// returns {}
proto = getPrototypeOf( function foo() {} );
// returns Function.prototype
})();
</script>
</body>
</html>@stdlib/assert-is-prototype-of: test if an object's prototype chain contains a provided prototype.
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
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