<div dir="ltr">Or an enumeration followed by a forEach.<div>["John", "Mike", "Amy", Kavin"].enumerate().forEach {</div><div> dic[$0] = $1</div><div>}</div><div>That said, it requires creating a dictionary var first, not a let. If there was an initialiser for Dictionary which took an Array or EnumerateSequence, that might be useful. I'm not sure how I'd attempt to write such an initialiser though.</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Jan 10, 2016 at 7:08 PM, Donnacha Oisín Kidney <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">I think that use of map is generally discouraged. forEach would probably be more explicit, or a for-loop.<div><br><div><blockquote type="cite"><div><div class="h5"><div>On 10 Jan 2016, at 18:58, 肇鑫 via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:</div><br></div></div><div><div><div class="h5"><div dir="ltr"><div class="gmail_default" style="font-family:georgia,serif">You can use dictionary in a map. You just ignore the return value of the map.</div><div class="gmail_default" style="font-family:georgia,serif"><br></div><div class="gmail_default"><div class="gmail_default"><font face="georgia, serif">var dic = [Int:String]()</font></div><div class="gmail_default"><font face="georgia, serif">var index = 0</font></div><div class="gmail_default"><font face="georgia, serif"><br></font></div><div class="gmail_default"><font face="georgia, serif">["John", "Mike", "Amy", "Kavin"].map {</font></div><div class="gmail_default"><font face="georgia, serif"> dic.updateValue($0, forKey: index)</font></div><div class="gmail_default"><font face="georgia, serif"> index += 1</font></div><div class="gmail_default"><font face="georgia, serif">}</font></div><div class="gmail_default"><font face="georgia, serif"><br></font></div><div class="gmail_default"><font face="georgia, serif">print(dic) // [2: "Amy", 0: "John", 1: "Mike", 3: "Kavin"]</font></div><div class="gmail_default"><font face="georgia, serif"><br></font></div><div class="gmail_default"><font face="georgia, serif">zhaoxin</font></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 11, 2016 at 1:50 AM, Kenny Leung 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">Hi All.<br>
<br>
I find that instead of using map() on arrays, I more often use an operation that returns a dictionary from an array. A common case is fetching an array of data, then creating a local cache of it indexed by ID.<br>
<br>
Is there a name for this operation? Is this something that others would like to see added to the standard library?<br>
<br>
-Kenny<br>
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