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<body><div>On Wed, Dec 30, 2015, at 02:13 AM, James Campbell wrote:<br></div>
<blockquote type="cite"><div>We should add the full collection of ruby methods <a href="http://matthewcarriere.com/06/23/using-select-reject-collect-inject-and-detect/">http://matthewcarriere.com/06/23/using-select-reject-collect-inject-and-detect/</a><br></div>
</blockquote><div> </div>
<div>We already have them. Well, almost:<br></div>
<div> </div>
<div>select - this is filter<br></div>
<div>reject - this is just filter with a negated predicate<br></div>
<div>collect - this is map<br></div>
<div>inject - this is reduce<br></div>
<div>detect - this is the find() method that I'm proposing here.<br></div>
<div> </div>
<div>-Kevin<br></div>
<div> </div>
<blockquote type="cite"><div><div>On 30 Dec 2015, at 02:40, Keith Smiley via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br></div>
</div>
<blockquote type="cite"><div><div>+1. We've added an extension for this and find it very useful.<br></div>
<div><div dir="ltr">On Tue, Dec 29, 2015 at 18:38 Kevin Ballard via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br></div>
<blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;"><div><u></u><br></div>
<div><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>
<div> </div>
<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>
</div>
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