<div dir="ltr">So <div><br></div><div><pre class="" style="margin-top:0px;margin-bottom:1em;padding:5px;border:0px;font-size:13px;overflow:auto;width:auto;max-height:600px;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;color:rgb(57,51,24);word-wrap:normal;background-color:rgb(238,238,238)"><code style="margin:0px;padding:0px;border:0px;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;white-space:inherit"><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">guard username</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">text</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">characters</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">count </span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">></span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">0</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,139)">else</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">{</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">
</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,139)">return</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">
</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">}</span></code></pre><pre class="" style="margin-top:0px;margin-bottom:1em;padding:5px;border:0px;font-size:13px;overflow:auto;width:auto;max-height:600px;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;word-wrap:normal"><font color="#000000">could be expressed as </font></pre><pre class="" style="margin-top:0px;margin-bottom:1em;padding:5px;border:0px;font-size:13px;overflow:auto;width:auto;max-height:600px;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;word-wrap:normal"><pre class="" style="margin-top:0px;margin-bottom:1em;padding:5px;border:0px;overflow:auto;width:auto;max-height:600px;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;color:rgb(57,51,24);word-wrap:normal;background-color:rgb(238,238,238)"><code style="margin:0px;padding:0px;border:0px;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;white-space:inherit"><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">unless(username</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">text</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">characters</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">count </span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">></span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">0) </span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">{</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">
</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,139)">return</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">
</span><span class="" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">}</span></code></pre><pre class="" style="margin-top:0px;margin-bottom:1em;padding:5px;border:0px;overflow:auto;width:auto;max-height:600px;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;word-wrap:normal"><font color="#000000">I think the second is much easier to read :)</font></pre></pre></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Dec 12, 2015 at 4:28 PM, Al Skipp via swift-evolution <span dir="ltr"><<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Top marks!<div><div><br></div><div>unless(condition) { print("condition was false") }</div></div><div><br></div><div>The feature implemented in the language. What’s not to like?</div><div><div class="h5"><div><br></div><div><div><blockquote type="cite"><div>On 12 Dec 2015, at 16:20, Tommy van der Vorst via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:</div><br><div><div style="word-wrap:break-word"><div>Oops, that should be just:</div><div><br></div><div>public func unless(expression: Bool, block: () -> ()) {<br><span style="white-space:pre-wrap"> </span>if !expression {<br><span style="white-space:pre-wrap"> </span>block()<br><span style="white-space:pre-wrap"> </span>}<br><div style="word-wrap:break-word"><div>}</div></div></div><br><div><blockquote type="cite"><div>Op 12 dec. 2015, om 17:17 heeft Tommy van der Vorst via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> het volgende geschreven:</div><br><div><div style="word-wrap:break-word"><div>Or, use something like this:</div><div><br></div><div>public func unless(expression: @autoclosure () -> Bool, block: () -> ()) {</div><div><span style="white-space:pre-wrap"> </span>if !expression {</div><div><span style="white-space:pre-wrap"> </span>block()</div><div><span style="white-space:pre-wrap"> </span>}</div><div>}</div><div><br></div><div>unless(..expression..) { </div><div><span style="white-space:pre-wrap"> </span>...code...</div><div>}</div><div><br></div><div>/T</div><br><div><blockquote type="cite"><div>Op 12 dec. 2015, om 17:08 heeft Al Skipp via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> het volgende geschreven:</div><br><div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><div>If at all possible I think it’s best to avoid adding keywords to the language. Instead of ‘unless', you could do: </div><div><br></div><div>public func not(bool: Bool) -> Bool { return !bool }</div><div><br></div><div>if not(condition) { print("condition was false") }</div></div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">Not terrible ¯\_(ツ)_/¯</div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><div><blockquote type="cite"><div>On 12 Dec 2015, at 15:48, Matthew Johnson via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:</div><br><div><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing: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 style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br><div><blockquote type="cite"><div>On Dec 12, 2015, at 9:45 AM, Arthur Ariel Sabintsev via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:</div><br><div>For your specific example, I'd 100% use the guard statement. It achieves the same result.<br><br>-1 from me.<br><div class="gmail_quote"><div dir="ltr">On Sat, Dec 12, 2015 at 9:43 AM J. Cheyo Jimenez 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: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">-1 from me. I think I would rather have an if-then expression that would handle both False and True cases. <div><a href="https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151207/001944.html" target="_blank">https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151207/001944.html</a><br><div><br></div><div>Also, in most cases I feel that guard would be a better choice. <div><br></div><div><br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Dec 12, 2015 at 5:39 AM, James Campbell via swift-evolution<span> </span><span dir="ltr"><<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>></span><span> </span>wrote:<br><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><br>Return false if james = nil<br><br>This returns false if the variable James is nil<br>. 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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div><span style="font-size:16px;line-height:19.2px"></span><span style="font-size:12.8px"> Wizard</span><br></div><div><a href="mailto:james@supmenow.com" target="_blank">james@supmenow.com</a></div><div>+44 7523 279 698</div></div></div></div></div></div>
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