<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">This one started over at swift-users, with a question on how to deal with looping over containers that may be nil.<div class=""><br class=""></div><div class="">Imho the beauty of the feature is that it's simple enough to be explained in the subject line, but here is the "long" story:</div><div class=""><br class=""></div><div class=""><div class=""><div class=""><span class="" style="font-variant-ligatures: no-common-ligatures;"><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(186, 45, 162);">let</span><span class="" style="font-variant-ligatures: no-common-ligatures;"> test: [</span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(112, 61, 170);">Int</span><span class="" style="font-variant-ligatures: no-common-ligatures;">]? = </span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(186, 45, 162);">nil</span></div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(186, 45, 162);"><br class=""></span></div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span class="" style="font-variant-ligatures: no-common-ligatures;"><div style="color: rgb(0, 132, 0); margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">// this is possible now</span></div><div style="color: rgb(0, 0, 0); margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">if</span><span style="font-variant-ligatures: no-common-ligatures" class=""> </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">let</span><span style="font-variant-ligatures: no-common-ligatures" class=""> test = test {</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures;" class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>for</span><span style="color: rgb(0, 0, 0); font-variant-ligatures: no-common-ligatures;" class=""> i </span><span style="color: rgb(186, 45, 162); font-variant-ligatures: no-common-ligatures;" class="">in</span><span style="color: rgb(0, 0, 0); font-variant-ligatures: no-common-ligatures;" class=""> test {</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span></span><span style="font-variant-ligatures: no-common-ligatures; color: rgb(62, 30, 129);" class="">print</span><span style="font-variant-ligatures: no-common-ligatures;" class="">(i)</span></div><div style="color: rgb(0, 0, 0); margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>}</span></div><div style="color: rgb(0, 0, 0); margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">}</span></div><div style="color: rgb(186, 45, 162);" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""><br class=""></span></div></span></div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(186, 45, 162);"><div style="color: rgb(0, 132, 0); margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures;" class="">// how it could be written with a modified keyword</span></div></span></div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(186, 45, 162);">for</span><span class="" style="font-variant-ligatures: no-common-ligatures;"> i </span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(186, 45, 162);">in?</span><span class="" style="font-variant-ligatures: no-common-ligatures;"> test</span><span class="" style="font-variant-ligatures: no-common-ligatures;"> {</span></div></span></div></div><div class=""><span class="" style="font-variant-ligatures: no-common-ligatures;"><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span class="" style="font-variant-ligatures: no-common-ligatures;"><span class="Apple-tab-span" style="white-space: pre;"> </span>print</span><span class="" style="font-variant-ligatures: no-common-ligatures;">(i)</span></div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span class="" style="font-variant-ligatures: no-common-ligatures;">}</span></div><div class=""><span class="" style="font-variant-ligatures: no-common-ligatures;"><br class=""></span></div><div class="">I've been thinking "in?" had been brought up long ago, but as I haven't found such a proposal, I probably confused it with the cancelled plan to write one on my own (or I just was to stupid to search ;-).</div><div class=""><br class=""></div><div class="">Syntactic sugar like this is definitely nothing that has priority now, but discussing it shouldn't be a big distraction — and if it turns into a proposal that as well survives review, it might be even simple enough to act as a trigger for me to finally get my hands on some real work for Swift ;-)</div><div class=""><br class=""></div><div class="">- Tino</div></span></div></div></body></html>