<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="">I believe this is the same as Scala’s for-comprehension….. and Scala’s for-comprehension is actually just syntactic sugar for a combination of flatMap, map and withFilter.<div class=""><br class=""></div><div class="">Although harder to read for many… it likely could be written similarly in Swift. </div><div class=""><br class=""></div><div class="">i.e. </div><div class=""><br class=""><blockquote type="cite" class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class=""><blockquote type="cite" class=""><div class=""><div class="">for row in 0..<m { for col in 0..<n where row+col < 5 { yield (row,col) } }</div></div></blockquote></div></div></blockquote><div class=""><br class=""></div><div class="">in Scala is</div><div class=""><br class=""></div><div class="">for {</div><div class=""> row <- 0 to m </div><div class=""> col <- 0 to n</div><div class=""> if row+col < 5</div><div class="">} yield (row, col)</div><div class=""><br class=""></div><div class="">which is actually (after the compiler is done with it):</div><div class=""><br class=""></div><div class="">(0 to m).flatMap(x => (0 to n).withFilter(y => x + y < 5).map(y => (x, y)))</div><div class=""><br class=""></div><div class="">I have not tried to do it in the playground but I would expect since I believe all the functions are available in Swift.</div><div class=""><br class=""></div><div class="">Note: 0 to m // is a range in Scala</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>withFilter is a filter which does not copy the contents of what it is filtering…. it is just applying the filter as needed when mapping.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 2016-01-15, at 3:35:23, Félix Cloutier 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=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">This has been proposed before and Chris said that it would be out of scope for Swift 3. There is definitely interest in this area though.<br class=""><div class="">
<br class="Apple-interchange-newline"><span style="font-family: 'Lucida Grande'; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Félix</span>
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<br class=""><div class=""><blockquote type="cite" class=""><div class="">Le 14 janv. 2016 à 15:30:07, Amir Michail via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> a écrit :</div><br class="Apple-interchange-newline"><div class=""><div class="">These would be like the unrolled versions of Python’s generator expressions.<br class=""><br class="">Examples:<br class=""><br class="">let a:[Int] = for x in l { yield x*2 }<br class=""><br class="">let b:[(Int,Int)] = for row in 0..<m { for col in 0..<n { yield (row,col) } }<br class=""><br class="">let c:[(Int,Int)] = for row in 0..<m { for col in 0..<n where row+col < 5 { yield (row,col) } }<br class=""><br class="">_______________________________________________<br class="">swift-evolution mailing list<br class=""><a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a><br class=""><a href="https://lists.swift.org/mailman/listinfo/swift-evolution" class="">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br class=""></div></div></blockquote></div><br class="">
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