<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=""><br class=""><div><blockquote type="cite" class=""><div class="">On Dec 12, 2015, at 11:28 AM, Al Skipp 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=""><span style="font-family: Helvetica; font-size: 14px; 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="">Top marks!</span><div class="" style="font-family: Helvetica; font-size: 14px; 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;"><div class=""><br class=""></div><div class="">unless(condition) { print("condition was false") }</div></div></div></blockquote><div><br class=""></div><div>Implicitly negated conditions cause confusion and bugs.</div><br class=""><blockquote type="cite" class=""><div class=""><div class="" style="font-family: Helvetica; font-size: 14px; 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: 14px; 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;">The feature implemented in the language. What’s not to like?</div><div class="" style="font-family: Helvetica; font-size: 14px; 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: 14px; 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;"><div class=""><blockquote type="cite" class=""><div class="">On 12 Dec 2015, at 16:20, Tommy van der Vorst 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="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="">Oops, that should be just:</div><div class=""><br class=""></div><div class="">public func unless(expression: Bool, block: () -> ()) {<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>if !expression {<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>block()<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>}<br class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="">}</div></div></div><br class=""><div class=""><blockquote type="cite" class=""><div class="">Op 12 dec. 2015, om 17:17 heeft Tommy van der Vorst via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> het volgende geschreven:</div><br class="Apple-interchange-newline"><div class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="">Or, use something like this:</div><div class=""><br class=""></div><div class="">public func unless(expression: @autoclosure () -> Bool, block: () -> ()) {</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>if !expression {</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>block()</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>}</div><div class="">}</div><div class=""><br class=""></div><div class="">unless(..expression..) { </div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>...code...</div><div class="">}</div><div class=""><br class=""></div><div class="">/T</div><br class=""><div class=""><blockquote type="cite" class=""><div class="">Op 12 dec. 2015, om 17:08 heeft Al Skipp via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> het volgende geschreven:</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;"><div class="">If at all possible I think it’s best to avoid adding keywords to the language. Instead of ‘unless', you could do: </div><div class=""><br class=""></div><div class="">public func not(bool: Bool) -> Bool { return !bool }</div><div class=""><br class=""></div><div class="">if not(condition) { print("condition was false") }</div></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;">Not terrible ¯\_(ツ)_/¯</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;"><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;"><div class=""><blockquote type="cite" class=""><div class="">On 12 Dec 2015, at 15:48, Matthew Johnson 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=""><span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 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;">I’m not sure about the single line aspect of this proposal, but I am a big proponent of “unless” and “until” as complements to “if” and “while”. They greatly improve readability over "if !(expression)” and “while !(expression)” IMHO.</span><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 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 class=""><blockquote type="cite" class=""><div class="">On Dec 12, 2015, at 9:45 AM, Arthur Ariel Sabintsev 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="">For your specific example, I'd 100% use the guard statement. It achieves the same result.<br class=""><br class="">-1 from me.<br class=""><div class="gmail_quote"><div dir="ltr" class="">On Sat, Dec 12, 2015 at 9:43 AM J. Cheyo Jimenez via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex;"><div dir="ltr" class="">-1 from me. I think I would rather have an if-then expression that would handle both False and True cases. <div class=""><a href="https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151207/001944.html" target="_blank" class="">https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151207/001944.html</a><br class=""><div class=""><br class=""></div><div class="">Also, in most cases I feel that guard would be a better choice. <div class=""><br class=""></div><div class=""><br class=""></div></div></div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Sat, Dec 12, 2015 at 5:39 AM, James Campbell via swift-evolution<span class="Apple-converted-space"> </span><span dir="ltr" class=""><<a href="mailto:swift-evolution@swift.org" target="_blank" class="">swift-evolution@swift.org</a>></span><span class="Apple-converted-space"> </span>wrote:<br class=""><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex;">I propose adding the unless and if statements from ruby.<br class=""><br class="">Return false if james = nil<br class=""><br class="">This returns false if the variable James is nil<br class="">. This line does it unless james is nil:<br class=""><br class="">Return false unless james = nil<br class=""><br class="">This has been really handy when working in ruby, reduces lines and pyramids of doom<br class=""><br class="">Sent from my iPhone<br class="">_______________________________________________<br class="">swift-evolution mailing list<br class=""><a href="mailto:swift-evolution@swift.org" target="_blank" class="">swift-evolution@swift.org</a><br class=""><a href="https://lists.swift.org/mailman/listinfo/swift-evolution" rel="noreferrer" target="_blank" class="">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br class=""></blockquote></div><br class=""></div><img src="https://u2002410.ct.sendgrid.net/wf/open?upn=QOj-2FXWMwrtGhHdk0ao-2FYqYPqIFSXRT0DG7Sea-2BCcxJN8c5RRhyvxdcersifGUQfEvSKA-2BcBWhD1IL2gdIk1Z0CqzR9cyYlLS6x2ISqAdFeWy8udykQsTYlY5El02WDIqpG7sRXq-2BJZwOCAxhwCrfyRgVMAG6-2FcFCyxFMDMuAC2m2vuiSL3IEmYfF1-2BnU827NC1-2FOUujQ-2B1nncjE3VhzlbBhcHN6AHbj9MPAYz-2B8du-2BQ-3D" alt="" width="1" height="1" border="0" class="" style="min-height: 1px !important; 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