<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">+1. Like others, this was one of the first stdlib extensions I’ve put into my Swift projects. It’s very common to want to find the first matching element in an array (or, perhaps even more common, find what you know if the only matching element — `filter` without the extra step of unpacking the value from array.)</div><div class=""><br class=""></div><div class="">It’s also common in other languages, and `find` is a good name.</div><br class=""><div class="">
<div class="">— Radek</div>
</div>
<br class=""><div><blockquote type="cite" class=""><div class="">On 30 Dec 2015, at 03:38, Kevin Ballard via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
<title class=""></title>
<div class=""><div class="">I'm proposing a new extension method on SequenceType called find(). It's similar to CollectionType.indexOf() except it returns the element:<br class=""></div>
<div class=""> </div>
<div class=""><div style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(112, 61, 170);" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">extension</span><span style="" class=""> </span>SequenceType<span style="" class=""> {</span></div><div style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(144, 45, 208);" class=""><span style="" class=""> </span>/// Returns the first element where `predicate` returns `true`, or `nil`</div><div style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(144, 45, 208);" class=""><span style="" class=""> </span>/// if such value is not found.</div><div style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">public</span> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">func</span> find(<span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">@noescape</span> predicate: (<span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">Self</span>.Generator.Element) <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">throws</span> -> <span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">Bool</span>) <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">rethrows</span> -> <span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">Self</span>.<span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">Generator</span>.<span style="font-variant-ligatures: no-common-ligatures; color: #703daa" class="">Element</span>? {</div><div style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">for</span> elt <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">in</span> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">self</span> {</div><div style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">if</span> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">try</span> predicate(elt) {</div><div style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">return</span> elt</div><div style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> }</div><div style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> }</div><div style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">return</span> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">nil</span></div><div style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> }</div><div style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class="">}<br class=""></div><div class=""> </div>
<div class="">-Kevin Ballard</div>
</div>
<div class=""> </div>
<img src="https://u2002410.ct.sendgrid.net/wf/open?upn=4hhvaxvZNsLrnZM9llg93kxoqfFYC8lhv8HAehOIDqIr5JRYRcrzfHZ7DQk9Y1pkL424nUvPOdUYJy92jQiQM8NzmTWwyUoWFdpjla9F0Qc0-2FB0cJhtMuKR6-2Fpmn7nPF4D6G73YyLws2wU8iJ5wvPq-2BAWZ05-2FvHm1ROcZFjFNQisjk6ojjOD16kG44cLcl9I9h0c74108tavs7lEc2eiQM-2Bzzu6cq5kVyG6JtDvJESA-3D" alt="" width="1" height="1" border="0" style="height:1px !important;width:1px !important;border-width:0 !important;margin-top:0 !important;margin-bottom:0 !important;margin-right:0 !important;margin-left:0 !important;padding-top:0 !important;padding-bottom:0 !important;padding-right:0 !important;padding-left:0 !important;" class="">
</div>
_______________________________________________<br class="">swift-evolution mailing list<br class=""><a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a><br class="">https://lists.swift.org/mailman/listinfo/swift-evolution<br class=""></div></blockquote></div><br class=""></body></html>