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<body><div>Proposal PR submitted as <a href="https://github.com/apple/swift-evolution/pull/94">https://github.com/apple/swift-evolution/pull/94</a><br></div>
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<div>-Kevin Ballard<br></div>
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<div>On Tue, Dec 29, 2015, at 06:38 PM, Kevin Ballard wrote:<br></div>
<blockquote type="cite"><div>I'm proposing a new extension method on SequenceType called find(). It's similar to CollectionType.indexOf() except it returns the element:<br></div>
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<div><p style="margin-top:0px;margin-bottom:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(112, 61, 170);"><span class="colour" style="color:rgb(187, 44, 162)">extension</span><span class="colour" style="color:rgb(0, 0, 0)"></span>SequenceType<span class="colour" style="color:rgb(0, 0, 0)"> {</span><br></p><p style="margin-top:0px;margin-bottom:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(144, 45, 208);"><span class="colour" style="color:rgb(0, 0, 0)"></span>/// Returns the first element where `predicate` returns `true`, or `nil`<br></p><p style="margin-top:0px;margin-bottom:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(144, 45, 208);"><span class="colour" style="color:rgb(0, 0, 0)"></span>/// if such value is not found.<br></p><p style="margin-top:0px;margin-bottom:0px;font-size:11px;line-height:normal;font-family:Menlo;"><span class="colour" style="color:rgb(187, 44, 162)">public</span> <span class="colour" style="color:rgb(187, 44, 162)">func</span> find(<span class="colour" style="color:rgb(187, 44, 162)">@noescape</span> predicate: (<span class="colour" style="color:rgb(187, 44, 162)">Self</span>.Generator.Element) <span class="colour" style="color:rgb(187, 44, 162)">throws</span> -> <span class="colour" style="color:rgb(112, 61, 170)">Bool</span>) <span class="colour" style="color:rgb(187, 44, 162)">rethrows</span> -> <span class="colour" style="color:rgb(112, 61, 170)">Self</span>.<span class="colour" style="color:rgb(112, 61, 170)">Generator</span>.<span class="colour" style="color:rgb(112, 61, 170)">Element</span>? {<br></p><p style="margin-top:0px;margin-bottom:0px;font-size:11px;line-height:normal;font-family:Menlo;"><span class="colour" style="color:rgb(187, 44, 162)">for</span> elt <span class="colour" style="color:rgb(187, 44, 162)">in</span> <span class="colour" style="color:rgb(187, 44, 162)">self</span> {<br></p><p style="margin-top:0px;margin-bottom:0px;font-size:11px;line-height:normal;font-family:Menlo;"><span class="colour" style="color:rgb(187, 44, 162)">if</span> <span class="colour" style="color:rgb(187, 44, 162)">try</span> predicate(elt) {<br></p><p style="margin-top:0px;margin-bottom:0px;font-size:11px;line-height:normal;font-family:Menlo;"><span class="colour" style="color:rgb(187, 44, 162)">return</span> elt<br></p><p style="margin-top:0px;margin-bottom:0px;font-size:11px;line-height:normal;font-family:Menlo;"> }<br></p><p style="margin-top:0px;margin-bottom:0px;font-size:11px;line-height:normal;font-family:Menlo;"> }<br></p><p style="margin-top:0px;margin-bottom:0px;font-size:11px;line-height:normal;font-family:Menlo;"><span class="colour" style="color:rgb(187, 44, 162)">return</span> <span class="colour" style="color:rgb(187, 44, 162)">nil</span><br></p><p style="margin-top:0px;margin-bottom:0px;font-size:11px;line-height:normal;font-family:Menlo;"> }<br></p><p style="margin-top:0px;margin-bottom:0px;font-size:11px;line-height:normal;font-family:Menlo;">}<br></p><div> </div>
<div>-Kevin Ballard<br></div>
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