<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="">Hello Haravikk,</div><div class=""><br class=""></div><div class="">Thank you. Yes I know this is possible,</div><div class="">but my main point is that for..in.. always expects an instance of some sort of a collection.</div><div class=""><br class=""></div><div class="">e.g for this for-loop:</div><div class=""><br class=""></div><div class="">for var x in -60.0.stride(to: 60.0, by: 0.001) </div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">What I don’t know: (can’t find yet)</div><div class="">>> Will in this case a large collection with 120000 elements of Double be created by .stride?</div><div class=""> or</div><div class="">>> Does .stride(), which in the end uses a descendant of SequenceType, just calculate a new value each time for..in.. uses .next() on this collection? </div><div class="">I hope the latter is true. </div><div class=""><br class=""></div><div class="">Can someone clarify this perhaps? </div><div class=""><br class=""></div><div class="">Still , I’d rather see a for variant with “from”</div><div class=""><br class=""></div><div class="">e.g.</div><div class=""><br class=""></div><div class=""> for x from xmin to xmax by xstep { }</div><div class=""><br class=""></div><div class=""> for x from xmax to xmin by -xstep { } </div><div class=""><br class=""></div><div class=""> for apple from 1 to applesInTruck { }</div><div class=""><br class=""></div><div class="">No need for collections in these cases,</div><div class=""><br class=""></div><div class="">Shouldn't be that hard to implement? </div><div class=""><br class=""></div><div class="">kind regards</div><div class="">Ted</div><div class=""><br class=""></div><div class=""><br class=""></div><br class=""><div class="">
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orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0);" class=""><span style="color: rgb(255, 0, 0); font-family: verdana, sans-serif;" class=""><font size="1" class="">ted van gaalen</font></span></div><div style="color: rgb(0, 0, 0); orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; -webkit-text-stroke-width: 0px; word-spacing: 0px; white-space: normal; text-transform: none; letter-spacing: normal;" class=""><font size="1" class=""><br class=""></font></div><div style="orphans: auto; text-align: start; 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<br class=""><div><blockquote type="cite" class=""><div class="">On 26.02.2016, at 12:45, Haravikk <<a href="mailto:swift-evolution@haravikk.me" class="">swift-evolution@haravikk.me</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=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On 26 Feb 2016, at 02:11, ted van gaalen via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><div class=""><br class="">for var n from 10 to 1 by -1 { } // looping backwards<br class=""></div></blockquote><div class=""><br class=""></div><div class="">This is currently possible with:</div><div class=""><br class=""></div><div class=""><font face="Monaco" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>for var n in (1 … 10).reverse()</font></div><div class=""><br class=""></div><div class="">Which I find pretty simple personally, though being able to do 10 … 1 would be nice.</div><div class=""><br class=""></div><blockquote type="cite" class=""><div class="">for var n from -10 to 12 // here, the compiler assumes and increment value of 1, no "by" is needed.<br class=""></div></blockquote><div class=""><br class=""></div><div class="">The following already does this one as-is:</div><div class=""><br class=""></div><div class=""><font face="Monaco" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>for var n in -10 … 12</font></div><div class=""><br class=""></div><blockquote type="cite" class=""><div class="">for var x: Float from -60.0 to 120 by 0.01 { } // this one has many iterations!<br class="">for var d from 0.0 to abyss by -rate {} </div></blockquote><br class=""></div><div class="">These two definitely make more of a case for this. I’m not so sure about introducing new keywords for this though.</div><div class=""><br class=""></div><div class="">Personally I think that what we need is a more flexible type for the … and ..< operators that is simple two related values in any order, which Range could be instantiated from with more strict conditions (must be low to high) for things like grabbing arrays slices and so-on where the order matters. The basic non-Range would then be optimised for use with loops to give us the greater flexibility without having to do stuff like using .reverse().</div><div class=""><br class=""></div><div class="">Plus ideally the new type would be capable of representing a full range of values; I really don’t like that Range<UInt8> is currently limited to 0-254 inclusive, since the endIndex is always exclusive, but that’s another topic really.</div></div></div></blockquote></div><br class=""></body></html>