<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 really don't like the "if cond then expr1 else expr2".<div class=""><br class=""></div><div class="">1) First of all, it's extremely verbose. It's almost as bad as the SQL construct "case when cond then expr1 else expr2 end".</div><div class=""><div class=""><br class=""></div><div class="">2) It makes Swift harder to learn. Newcomers will be confused why you sometimes need to use curly braces and why at other times you need to use the "then" keyword.</div><div class=""><br class=""></div><div class="">3) It doesn't help when you want to do multi-line calculations</div><div class=""><br class=""></div><div class="">But there is one good side to this proposal: it nests more naturally than the ternary operator:</div><div class="">"if cond then expr1 else if cond2 then expr2 else expr3"</div><div class="">vs.</div><div class="">"cond ? expr1 : (cond2 ? expr2 : expr3)</div><div class=""><br class=""></div><div class="">The proposed syntax for the switch statement is so confusing that I really don't think it is a good idea.</div><div class=""><br class=""></div><div class="">Why not just allow normal if statements to return values?</div><div class="">I don't see what's so bad about the following:</div><div class="">"let value = if cond {expr1} else {expr2}"</div><div class=""><br class=""></div><div class="">This would also extend to multiple lines:</div><div class="">let value = if cond {</div><div class=""> expr1</div><div class="">} else {</div><div class=""> let something = Object()</div><div class=""> something.doStuff()</div><div class=""> something</div><div class="">}</div><div class=""><br class=""></div><div class="">Jakob</div><div class=""><br class=""></div><div class=""><div class=""><div><blockquote type="cite" class=""><div class="">On 13 Dec 2015, at 06:54, Paul Ossenbruggen 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=""><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; 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;">Hello All, </div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; 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;"><br class=""></div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; 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;">Been sick in bed all day, but decided to try to be productive…</div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; 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;"><br class=""></div><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; 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; float: none; display: inline !important;" class="">I did a rough draft of a proposal for implementing if expressions and switch expressions based upon the discussions we had here. I have tried to keep the scope of the changes as small as possible, only added one keyword and kept things as similar to the existing language constructs as possible. If anyone wants to help me with this, or has feedback, please let me know,</span><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; 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;"><br class=""></div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; 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;"><a href="https://github.com/possen/swift-evolution/blob/master/0020.md" class="">https://github.com/possen/swift-evolution/blob/master/0020.md</a></div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; 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;"><br class=""></div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; 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;">Thanks,</div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; 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;">- Paul</div></div></blockquote></div><br class=""></div></div></div></body></html>