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<body><div>I completely disagree. Being able to compare `Optional` values is very handy in a lot of cases. Adding special syntax for this is just unnecessary language complication, especially as the proposed syntax conflicts with the existing meaning of the postfix-? operator and the optional-chaining operator.<br></div>
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<div>-Kevin Ballard</div>
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<div>On Thu, Dec 3, 2015, at 04:17 PM, Jacob Bandes-Storch wrote:<br></div>
<blockquote type="cite"><div dir="ltr"><div>Agreed — or, I think, these operators could/should simply be removed.<br></div>
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<div>I filed <rdar://22833869> about this a while ago, which was marked as Duplicate/<rdar://16966712>.<br></div>
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<div><pre style="outline-style:none;outline-color:initial;outline-width:initial;font-family:inherit;font-size:13px;margin-top:0px;margin-bottom:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;white-space:pre-wrap;word-wrap:break-word;color:rgb(0, 0, 0);"><blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;"><div>Summary:<br></div>
<div>This returns true:
(nil as Int?) < 0
This also returns true, which makes even less sense:
(nil as Int?) < Int.min<span class="font" style="font-family:inherit"></span><br></div>
</blockquote><blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;"><br></blockquote><blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;"><div>Expected Results:<br></div>
<div>nil < 0, nil > 0, and nil == 0, should all be false. nil != 0 should be true.
Alternatively, just *don't* provide < and > operators that accept optional arguments.<span class="font" style="font-family:inherit"></span><br></div>
</blockquote><blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;"><span class="font" style="font-family:inherit"></span><br></blockquote><blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;"><div>Actual Results:<br></div>
<div>nil < 0 is true. Others are as expected.<br></div>
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<div>See also: <a href="https://twitter.com/jtbandes/status/646914031433871364">https://twitter.com/jtbandes/status/646914031433871364</a><br></div>
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<div><div><div dir="ltr"><div>Jacob<br></div>
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<div><div>On Thu, Dec 3, 2015 at 3:42 PM, Amir Michail <span dir="ltr"><<a href="mailto:a.michail@me.com">a.michail@me.com</a>></span> wrote:<br></div>
<blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;"><div>Such comparisons with optionals can result in hard to find bugs.<br></div>
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For example consider:<br></div>
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let f = x < 5 // x is of type Int? and may be nil<br></div>
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The proposed ? suffix would be used as follows and makes the possibility of nil very clear:<br></div>
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let f = x? < 5<br></div>
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