<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="">There is no equivalent to something like <div class=""><br class=""></div><div class="">array.zipWithIndex.toMap (or in this case array.zipWithIndex.toDictionary // where zipWithIndex creates tuples with the index - a specialized case of zip for Arrays with indexes.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 2016-01-11, at 2:41:59, Ross O'Brien 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=""><div dir="ltr" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">Or an enumeration followed by a forEach.<div class="">["John", "Mike", "Amy", Kavin"].enumerate().forEach {</div><div class=""> dic[$0] = $1</div><div class="">}</div><div class="">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 class=""><br class=""></div></div><div class="gmail_extra" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""><div class="gmail_quote">On Sun, Jan 10, 2016 at 7:08 PM, Donnacha Oisín Kidney<span class="Apple-converted-space"> </span><span dir="ltr" class=""><<a href="mailto:swift-evolution@swift.org" target="_blank" class="">swift-evolution@swift.org</a>></span><span class="Apple-converted-space"> </span>wrote:<br class=""><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex;"><div style="word-wrap: break-word;" class="">I think that use of map is generally discouraged. forEach would probably be more explicit, or a for-loop.<div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class=""><div class="h5"><div class="">On 10 Jan 2016, at 18:58, 肇鑫 via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank" class="">swift-evolution@swift.org</a>> wrote:</div><br class=""></div></div><div class=""><div class=""><div class="h5"><div dir="ltr" class=""><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 class=""></div><div class="gmail_default"><div class="gmail_default"><font face="georgia, serif" class="">var dic = [Int:String]()</font></div><div class="gmail_default"><font face="georgia, serif" class="">var index = 0</font></div><div class="gmail_default"><font face="georgia, serif" class=""><br class=""></font></div><div class="gmail_default"><font face="georgia, serif" class="">["John", "Mike", "Amy", "Kavin"].map {</font></div><div class="gmail_default"><font face="georgia, serif" class=""> <span class="Apple-converted-space"> </span>dic.updateValue($0, forKey: index)</font></div><div class="gmail_default"><font face="georgia, serif" class=""> <span class="Apple-converted-space"> </span>index += 1</font></div><div class="gmail_default"><font face="georgia, serif" class="">}</font></div><div class="gmail_default"><font face="georgia, serif" class=""><br class=""></font></div><div class="gmail_default"><font face="georgia, serif" class="">print(dic) // [2: "Amy", 0: "John", 1: "Mike", 3: "Kavin"]</font></div><div class="gmail_default"><font face="georgia, serif" class=""><br class=""></font></div><div class="gmail_default"><font face="georgia, serif" class="">zhaoxin</font></div></div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Mon, Jan 11, 2016 at 1:50 AM, Kenny Leung via swift-evolution<span class="Apple-converted-space"> </span><span dir="ltr" class=""><<a href="mailto:swift-evolution@swift.org" target="_blank" class="">swift-evolution@swift.org</a>></span><span class="Apple-converted-space"> </span>wrote:<br class=""><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex;">Hi All.<br class=""><br class="">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 class=""><br class="">Is there a name for this operation? Is this something that others would like to see added to the standard library?<br class=""><br class="">-Kenny<br class=""><br class="">_______________________________________________<br class="">swift-evolution mailing list<br class=""><a href="mailto:swift-evolution@swift.org" target="_blank" class="">swift-evolution@swift.org</a><br class=""><a href="https://lists.swift.org/mailman/listinfo/swift-evolution" rel="noreferrer" target="_blank" class="">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br class=""></blockquote></div><br class=""><br clear="all" class=""><div class=""><br class=""></div>--<span class="Apple-converted-space"> </span><br class=""><div class=""><div dir="ltr" class=""><div class=""><br class="">Owen Zhao<br class=""></div></div></div></div></div></div><img src="https://u2002410.ct.sendgrid.net/wf/open?upn=Lo8TP3b1oIn3yQXUt9zA1UCQfR-2BMBCuqnubTuDg47-2B3usexigrc8Iux9vXvgEAL0wRBdvtEFYxIxVfpyrhimQ4cGMsUZ-2B8-2BzVACTkBFoqIlPq4LVSf1ja8P72Sb-2FyyYt9BGH7M4C6MzLueO2GJhnZPKVrov-2Bnlo8QRW-2F1jqAtsX8ozJnv60diTlz-2FdZn7ZRo7T-2FlH8GS9OrtmYfgoyV-2BeWujH-2BMRrf9qDt7r2azAtgA-3D" alt="" width="1" height="1" border="0" style="min-height: 1px !important; 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