<div dir="ltr">>A value-value map is just simpler and cleaner, while almost always giving you what you need.<div>+1<br></div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, May 23, 2016 at 10:59 PM Brent Royal-Gordon 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">> I have a small remark though, wouldn’t it be better to let transform be of type (Key, Value) throws -> T instead of (Value) throws -> T? You can just ignore the key (with _) if you don’t need it, but I think it might come in handy in some cases.<br>
<br>
The problem is, that closes the door to writing many simple maps in functional style. For instance, this:<br>
<br>
dictionaryOfNumbers.mapValues(abs)<br>
<br>
Would have to become this:<br>
<br>
dictionaryOfNumbers.mapValues { _, v in abs(v) }<br>
<br>
(It *might* be possible to do it with `$1`, but I'm not sure; there are some limitations around that.)<br>
<br>
A value-value map is just simpler and cleaner, while almost always giving you what you need.<br>
<br>
--<br>
Brent Royal-Gordon<br>
Architechies<br>
<br>
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</blockquote></div><div dir="ltr">-- <br></div><div><div dir="ltr"><div><div>Dan Appel<br></div></div></div></div>