<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>I suspect that if there were an 'advanced' `map` it would largely eliminate `forEach` since a main use of <span style="background-color: rgba(255, 255, 255, 0);">`forEach` is because of limitation in map like multiple returns, combined map and filtering, etc.</span></div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">The comment that you have to ignore a warning is however a valid point, perhaps like other languages, e.g. Java, you could have a `@suppress_unused_result_warning` annotation.<br><br>Sent from my iPad</div><div><br>On 31 Dec 2015, at 9:41 PM, ilya via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="white-space:pre-wrap">I like having separate forEach. As already said, forEach produces different visual grouping of logic compared to for operator. It's especially useful if you just pass a named function to it. <br><br>forEach is also not the same as map: <br><br>let block: Int -> Void = ...<br>[1,2,3].map(block) <br><br>Here the result has the type [Void], not Void and the compiler correctly produces a warning. We'd have to explicitly assign the result to silence it, which now hides the fact that block wasn't producing anything in the first place. <br><br>This will hold true for any advanced variant of map. <br><br>Ilya. <br></div><div class="gmail_quote"><div dir="ltr">On Thu, Dec 31, 2015 at 10:30 Dave Abrahams via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><br><div>
<div>-Dave</div>
</div>
<br><div></div></div><div style="word-wrap:break-word"><div><blockquote type="cite"><div>On Dec 30, 2015, at 8:48 PM, Kevin Ballard via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:</div><br><div>
<div><div>Swift didn't use to have forEach(). It was added fairly late, and I suspect (though I don't actually know) that it was done so to appease people who kept abusing map() for the same function, as well as the die-hard everything-must-be-functional crowd.<br></div></div></div></blockquote><div><br></div></div></div><div style="word-wrap:break-word"><div>Those are two of the reasons. But the reason that put forEach over the line and convinced me to add it, just slightly, was syntactic:</div><div><br></div><div><font face="Menlo">for x in some.very.long[chain]</font></div><div><font face="Menlo"> .of.map { $0 }</font></div><div><font face="Menlo"> .filter { something }.whatever {</font></div><div><font face="Menlo"> ...</font></div><div><font face="Menlo">}</font></div><div><br></div><div>reads "inside-out," like nested(free(function(calls())))) vs.</div><div><br></div><div><div><font face="Menlo">some.very.long[chain]</font></div><div><font face="Menlo"> .of.map { $0 }</font></div><div><font face="Menlo"> .filter { something }.whatever</font></div><div><font face="Menlo"> .forEach { x in</font></div><div><font face="Menlo"> ...</font></div></div></div><div style="word-wrap:break-word"><div><div><font face="Menlo"> }</font></div><div><br></div><blockquote type="cite"><div><div>
<div> </div>
<div>Personally, I'd rather we didn't have it because it encourages people to use it, but I suppose it's better to give people an appropriate tool than to keep watching them abuse map().</div>
<div> </div>
<div>-Kevin Ballard<br></div>
<div> </div>
<div>On Wed, Dec 30, 2015, at 04:50 PM, Craig Cruden via swift-evolution wrote:<br></div>
<blockquote type="cite"><div>I don’t see the benefit of taking a simple declarative expression (map, flatMap, filter) and turning it into a complicated imperative/iterative loop. You already have the ability to iterate through a set and do whatever you want to do with with whatever logic you want to use using. I would have no problem for the most part removing foreach - it is more of a convenience method for doing an iterative loop through a collection - and to be quite honest rarely use outside of maybe putting in a print statement temporarily in there (but more often just turn the resulting set into comma delimited output and printing it). <br></div>
<div> </div>
<div><div> </div>
<div><blockquote type="cite"><div>On 2015-12-31, at 5:10:22, Howard Lovatt via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:<br></div>
<div> </div>
<div><div><div> </div>
<div><div><span>You could replace `forEach` with a supped up `map` that also allowed `break` and `continue`. The following </span><span style="background-color:rgba(255,255,255,0)">library function gives `continue` and `break` and also combines `repeat`, `times`, `forEach`, `filter`, `flatMap`, and `map` into one:</span><br></div>
<div><div> </div>
<blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:40px;border-top-style:none;border-right-style:none;border-bottom-style:none;border-left-style:none;border-top-width:initial;border-right-width:initial;border-bottom-width:initial;border-left-width:initial;border-top-color:initial;border-right-color:initial;border-bottom-color:initial;border-left-color:initial;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px"><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>public</span> <span>final</span> <span>class</span> MapController<E, R> {</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>var</span> results = [R]()</span><br></div><div style="margin:0px;line-height:normal;min-height:13px"><span style="background-color:rgba(255,255,255,0)"></span><br></div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>var</span> isContinuing = <span>true</span></span><br></div><div style="margin:0px;line-height:normal;min-height:13px"><span style="background-color:rgba(255,255,255,0)"></span><br></div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>init</span><C: CollectionType <span>where</span> C.Generator.Element == E>(<span>_</span> collection: C, sizeEstimate: Int = <span>0</span>, <span>@noescape</span> mapper: (controller: MapController<E, R>, element: E) <span>throws</span> -> R?) <span>rethrows</span> {</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"> results.reserveCapacity(sizeEstimate)</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>for</span> <span>var</span> generator = collection.generate(), element = generator.next(); element != <span>nil</span> && isContinuing; element = generator.next() {</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>let</span> result = <span>try</span> mapper(controller: <span>self</span>, element: element!)</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>if</span> <span>let</span> actualResult = result {</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"> results.append(actualResult)</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"> }</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"> }</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"> }</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)">}</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;min-height:13px"> </div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>extension</span><span></span>CollectionType<span> {</span></span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span></span>/// Controllable `map`, additional controls beyond simple `map` are:</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>///</span></span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span></span>/// 1. Continue without returning a result (`return nil`)</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span></span>/// 2. Return multiple results (`control.results += [...]` then `return nil`)</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span></span>/// 3. Break (`control.isContinuing = false` then `return nil`)</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>///</span></span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span></span>/// These additional controls allow this `map` to function like `repeat`, `times`, `forEach`, `filter`, `flatMap`, and `map` combined into one as well as providing an early termination (break).</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>@warn_unused_result</span> <span>func</span> map<R>(sizeEstimate sizeEstimate: Int = <span>0</span>, <span>@noescape</span> mapper: (controller: MapController<<span>Self</span>.Generator.Element, R>, element: <span>Self</span>.Generator.Element) <span>throws</span> -> R?) <span>rethrows</span> -> [<span>R</span>] {</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>return</span> <span>try</span> MapController(<span>self</span>, sizeEstimate: sizeEstimate, mapper: mapper).results</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"> }</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)">}</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;min-height:13px"> </div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)">// Demonstration of full functionality including continue, break, and multiple returns</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>var</span> result = (<span>0</span> ..< <span>5</span>).map { (control, index) -> <span>Int</span>? <span>in</span></span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>switch</span> index {</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>case</span> <span>1</span>:</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span></span><span>return</span><span></span><span>nil</span><span></span>// Continue - skip 1 (`filter`)</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>case</span> <span>2</span>:</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span> control.results.append(</span><span>2</span><span>) </span>// Yield two results - this one and the 'return’ yield (`flatMap`)</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>case</span> <span>3</span>:</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span> control.isContinuing = </span><span>false</span><span></span>// Break after next yield - which could be `return nil` if there are no more results</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span></span>default<span>:</span></span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>break</span></span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"> }</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span></span><span>return</span><span> index </span>// Yield next result - except for case 1 all the above yield `index`</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)">}</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>print(result) </span>// prints `[0, 2, 2, 3]` note missing "1", double "2", and last is "3"</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;min-height:13px"> </div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)">// Demonstration of `repeat`/`forEach`/`times` like usage - note `(_, _) -> Void?`</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)">result = [Int]()</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)">(<span>0</span> ..< <span>3</span>).map { (<span>_</span>, <span>_</span>) -> <span>Void</span>? <span>in</span></span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"> result.append(<span>1</span>) <span>// Do whatever - in this case append to a global</span></span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span></span><span>return</span><span></span><span>nil</span><span></span>// Don't yield any results</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)">}</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="background-color:rgba(255,255,255,0)"><span>print(result) </span>// prints `[1, 1, 1]`</span><br></div>
</blockquote><div> </div>
</div>
<div><span style="background-color:rgba(255,255,255,0)">Would this be a superior alternative to both `forEach` and `times` in the library and `repeat` as a language feature?</span><br></div>
<div> </div>
<div><span>Sent from my iPad</span><br></div>
</div>
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