<div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Wed, Jul 20, 2016 at 1:14 PM Guillaume Lessard via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
> On 20 juil. 2016, at 12:42, Michael Peternell via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:<br>
><br>
> +1<br>
> this should be a bugfix.<br>
<br>
First, NSString’s prefix function returns false for empty string parameters, and this would be a significant departure in behaviour.<br></blockquote><div><br></div><div>It would be a significant correction in behavior.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Second, while an empty string is technically a prefix to any other string, that is hardly ever an interesting answer; it is a trivial solution, just as y=0 is for y(x)=y’(x). It is easy to special-case if one really needs to consider the empty string.<br></blockquote><div><br></div><div>On the contrary—I've written code in the past that expected this behavior (because why wouldn't I? It's the correct behavior) and was quite surprised when NSString's behavior resulted in a bug.</div><div><br></div><div>NSString being plain wrong here should not consign us to wrongness forever. Every other mainstream language I use day-to-day implements this correctly, and so should Swift.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Cheers,<br>
Guillaume Lessard<br>
<br>
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