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<h1 class="j2-anchor">
<span>RbObjectCollection</span>
</h1>
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<div class="j2-callout-title" role="heading" aria-level="6">Swift</div>
<pre><code class="language-swift">public struct RbObjectCollection: <a href="https://developer.apple.com/documentation/swift/randomaccesscollection?language=swift">RandomAccessCollection</a>,
<a href="https://developer.apple.com/documentation/swift/mutablecollection?language=swift">MutableCollection</a>,
<a href="https://developer.apple.com/documentation/swift/rangereplaceablecollection?language=swift">RangeReplaceableCollection</a>,
<a href="../types/rbobjectconvertible.html?swift">RbObjectConvertible</a></code></pre>
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<p>A view onto a Ruby array using Swift collection protocols.</p>
<p>This is an adapter type that wraps an <a href="../types/rbobject13.html?swift"><code>RbObject</code></a> and adopts
Swift collection protocols for use with an underlying Ruby
array (or any Ruby object that supports <code>length</code>, <code>[]</code>, and
<code>[]=</code>.)</p>
<p>For example:</p>
<pre><code class="language-swift">myObj.collection.replaceSubrange(lower..<upper, with: otherArray)
</code></pre>
<p>This is separate to <a href="../types/rbobject13.html?swift"><code>RbObject</code></a> to avoid dumping all the
collection protocol members into its dynamic member lookup
namespace.</p>
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<h1 class="sr-only">Topics</h1>
<section class="j2-swift">
<section id="init_27" class="j2-item j2-swift">
<a name="//apple_ref/cpp/Constructor/init(RbObject)" class="dashAnchor j2-item-dash-anchor" data-item-id="init_27"></a>
<h4 class="sr-only">init(RbObject)</h4>
<a class="j2-item-title" href="#_init_27" data-toggle="collapse" role="button" aria-expanded="false" aria-controls="_init_27"><code>
<span class="j2-swift">init<span class="j2-item-secondary">(RbObject)</span></span>
</code></a>
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<p>Create a collection from an existing Ruby array object.</p>
<p>The same thing as accessing <a href="../types/rbobject13.html?swift#collection"><code>RbObject.collection</code></a>.</p>
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<h5>Declaration</h5>
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<div class="j2-callout-title" role="heading" aria-level="6">Swift</div>
<pre><code class="language-swift">public init(_ value: <a href="../types/rbobject13.html?swift">RbObject</a>)</code></pre>
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<section id="rubyobject24" class="j2-item j2-swift">
<a name="//apple_ref/cpp/Property/var%20rubyObject%3A%20RbObject" class="dashAnchor j2-item-dash-anchor" data-item-id="rubyobject24"></a>
<h4 class="sr-only">var rubyObject: RbObject</h4>
<a class="j2-item-title" href="#_rubyobject24" data-toggle="collapse" role="button" aria-expanded="false" aria-controls="_rubyobject24"><code>
<span class="j2-swift"><span class="j2-item-secondary">var </span>rubyObject<span class="j2-item-secondary">: RbObject</span></span>
</code></a>
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<p>The Ruby object for the underlying array.</p>
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<h5>Declaration</h5>
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<div class="j2-callout-title" role="heading" aria-level="6">Swift</div>
<pre><code class="language-swift">public private(set) var rubyObject: <a href="../types/rbobject13.html?swift">RbObject</a> { get }</code></pre>
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</section>
</section>
<section class="j2-swift">
<a name="//apple_ref/cpp/Section/Collection%20protocol%20conformance" class="dashAnchor"></a>
<h3 class="j2-anchor" id="tpc-collection-protocol-conformance">
<span data-anchor-id="tpc-collection-protocol-conformance">Collection protocol conformance</span>
</h3>
<section id="init1" class="j2-item j2-swift">
<a name="//apple_ref/cpp/Constructor/init()" class="dashAnchor j2-item-dash-anchor" data-item-id="init1"></a>
<h4 class="sr-only">init()</h4>
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<span class="j2-swift">init<span class="j2-item-secondary">()</span></span>
</code></a>
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<p>Create an empty collection - an empty Ruby array.</p>
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<h5>Declaration</h5>
<div class="j2-item-declaration">
<div class="j2-swift">
<div class="j2-callout-title" role="heading" aria-level="6">Swift</div>
<pre><code class="language-swift">public init()</code></pre>
</div>
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</section>
<section id="startindex" class="j2-item j2-swift">
<a name="//apple_ref/cpp/Property/var%20startIndex%3A%20Int" class="dashAnchor j2-item-dash-anchor" data-item-id="startindex"></a>
<h4 class="sr-only">var startIndex: Int</h4>
<a class="j2-item-title" href="#_startindex" data-toggle="collapse" role="button" aria-expanded="false" aria-controls="_startindex"><code>
<span class="j2-swift"><span class="j2-item-secondary">var </span>startIndex<span class="j2-item-secondary">: Int</span></span>
</code></a>
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<p>The position of the first element in a nonempty collection.</p>
<p>If the collection is empty, <code>startIndex</code> is equal to <a href="../types/rbobjectcollection.html?swift#endindex"><code>endIndex</code></a>.</p>
</div>
<h5>Declaration</h5>
<div class="j2-item-declaration">
<div class="j2-swift">
<div class="j2-callout-title" role="heading" aria-level="6">Swift</div>
<pre><code class="language-swift">public var startIndex: <a href="../extensions/int.html?swift">Int</a> { get }</code></pre>
</div>
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</section>
<section id="endindex" class="j2-item j2-swift">
<a name="//apple_ref/cpp/Property/var%20endIndex%3A%20Int" class="dashAnchor j2-item-dash-anchor" data-item-id="endindex"></a>
<h4 class="sr-only">var endIndex: Int</h4>
<a class="j2-item-title" href="#_endindex" data-toggle="collapse" role="button" aria-expanded="false" aria-controls="_endindex"><code>
<span class="j2-swift"><span class="j2-item-secondary">var </span>endIndex<span class="j2-item-secondary">: Int</span></span>
</code></a>
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