<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="">Thanks! Then looks very interesting and I’ll reach out to the lead there and see if they’re interested in working together. It definitely highlights similar readability issues I had outlined. I’m curious if there are compiler or other advantages to initializing more properties before continuing in the scope. For example race conditions, mulitthread support, concurrency... If you want to initialize more of an object than any single initializer allows being able to create it and set all desired properties before the system denotes it as officially initialized might be helpful. This would make a distinction between the init then { // do something} model verses init with { // do this to create it }.</div><div class=""><br class=""></div><div class="">-Weston</div><br class=""><div><blockquote type="cite" class=""><div class="">On Jan 3, 2016, at 9:09 PM, Adriano Ferreira <<a href="mailto:adriano.ferreira@me.com" class="">adriano.ferreira@me.com</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=""><div class="">Hey there!</div><div class=""><br class=""></div><div class="">As a suggestion, check out this simple yet very interesting project called <a href="https://github.com/devxoul/Then" class="">Then</a> by @devxoul.</div><div class=""><br class=""></div><div class="">Best,</div><div class=""><br class=""></div><div class="">— A</div><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Jan 3, 2016, at 1:37 AM, Weston Catron 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=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" 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=""><div class=""><span class=""></span></div><div class=""><meta http-equiv="content-type" content="text/html; charset=utf-8" class=""><div class=""><span class=""></span></div><div class="">Ability to write an initializer while initializing an object.<div class=""><br class=""></div><div class="">Example</div><div class=""><br class=""></div><div class="">let name = “John Apple”;</div><div class="">let person = Person {</div><div class=""> self.name = nameInput.first() + " " + nameInput.last()</div><div class=""> self.dob = dateInput.datetime()</div><div class=""> If (self.age() > 18) {</div><div class=""> self.taxableStatus = INDEPENDANT</div><div class=""> } else {</div><div class=""> self.taxableStatus = DEPENDANT</div><div class=""> }</div><div class="">};</div><div class=""><br class=""></div></div><div class="">Helpful examples: Objects with many required parameters that are defaulted in the initializers. </div><div class=""><br class=""></div><div class="">SKLabelNode</div><div class=""><span class="title" style="background-color: rgba(255, 255, 255, 0);"><br class=""></span></div><div class=""><span class="title" style="background-color: rgba(255, 255, 255, 0);">let</span><span style="background-color: rgba(255, 255, 255, 0);" class=""> </span><span class="title" style="background-color: rgba(255, 255, 255, 0);">label</span><span style="background-color: rgba(255, 255, 255, 0);" class=""> = </span><span class="title" style="background-color: rgba(255, 255, 255, 0);">SKLabelNode</span><span style="background-color: rgba(255, 255, 255, 0);" class="">(</span><span class="title" style="background-color: rgba(255, 255, 255, 0);">text</span><span style="background-color: rgba(255, 255, 255, 0);" class="">: "Example") </span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><span class="line" style="counter-increment: lines 1;"></span> <span class="title">label</span>.<span class="title">position</span> = <span class="title">CGPoint</span>(<span class="title">x</span>: 0, <span class="title">y</span>: 250); </span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><span class="line" style="counter-increment: lines 1;"></span> <span class="title">label</span>.<span class="title">fontSize</span> = 34; </span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><span class="line" style="counter-increment: lines 1;"></span> <span class="title">label</span>.<span class="title">fontColor</span> = <span class="title">UIColor</span>.<span class="title">blackColor</span>() </span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><span class="line" style="counter-increment: lines 1;"></span> <span class="title">self</span>.<span class="title">addChild</span>(<span class="title">label</span>);</span></div><div class=""><br class=""></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">Can become:</span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><br class=""></span></div><div class=""><span class="title" style="background-color: rgba(255, 255, 255, 0);">let label = SKLabelNode</span><span style="background-color: rgba(255, 255, 255, 0);" class="">(</span><span class="title" style="background-color: rgba(255, 255, 255, 0);">text</span><span style="background-color: rgba(255, 255, 255, 0);" class="">: </span><span class="title" style="background-color: rgba(255, 255, 255, 0);">self</span><span style="background-color: rgba(255, 255, 255, 0);" class="">.</span><span class="title" style="background-color: rgba(255, 255, 255, 0);">package</span><span style="background-color: rgba(255, 255, 255, 0);" class="">!.</span><span class="title" style="background-color: rgba(255, 255, 255, 0);">title</span><span style="background-color: rgba(255, 255, 255, 0);" class="">) {</span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><span class="line" style="counter-increment: lines 1;"></span><span class="title"> self</span>.<span class="title">position</span> = <span class="title">CGPoint</span>(<span class="title">x</span>: 0, <span class="title">y</span>: 250)</span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><span class="title"> self</span>.<span class="title">fontSize</span> = 34</span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><span class="title"> self</span>.<span class="title">fontColor</span> = <span class="title">UIColor</span>.<span class="title">blackColor</span>() </span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">}</span></div><div class="">self.addChild(label)</div><div class=""><br class=""></div><div class=""><b class="">Readability</b> Instead of a large amount of code setting up temporary variables to pass into an initializer, all initializing code could be wrapped in a closure.</div><div class=""><br class=""></div><div class=""><b class="">Flexibility</b> Instead of exhaustive initializers covering many use cases. Simpler initializers can be extended as needed. <span style="background-color: rgba(255, 255, 255, 0);" class="">This can also encourage required properties over optional ones that are immediately defined. </span></div><div class=""><br class=""></div><div class=""><b class="">Compiler Warnings</b> Closures react the same as initializers within classes, warning users of incomplete implementation of required properties.</div><div class=""><br class=""></div><div class="">Possible disadvantages:</div><div class=""><br class=""></div><div class=""><b class="">Sloppy Coding</b> Instead of writing complete initializers programmers can just rely on in-line initializers. </div><div class=""><br class=""></div><div class=""><b class="">Tried Before</b> I found this feature is also available in C# (<a href="https://msdn.microsoft.com/en-us/library/bb397680.aspx" class="">https://msdn.microsoft.com/en-us/library/bb397680.aspx</a>). Not sure if it was helpful then but many languages since don't appear to use it. </div><div class=""><br class=""></div><div class=""><div class=""><!-- signature open -->-Weston<!-- signature close --></div></div></div>
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