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May 7, 2016 08:24
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| --Apple-Mail=_59C7D647-374A-400F-8319-847E1514446E | |
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| <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html = | |
| charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; = | |
| -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = | |
| class=3D""><h2 class=3D"chapter-name" style=3D"border: 0px; font-size: = | |
| 2.8em; margin: 21px 0px 0px; outline: 0px; padding: 15px 25px; = | |
| vertical-align: baseline; font-weight: 100;">Collection = | |
| Types</h2><section class=3D"section" style=3D"padding: 15px 25px = | |
| 30px;"><p class=3D"para" style=3D"border: 0px; font-size: 1.4em; margin: = | |
| 0px 0px 15px; outline: 0px; padding: 0px; vertical-align: baseline; = | |
| color: rgb(65, 65, 65); line-height: 20.299999237060547px;">Swift = | |
| provides three primary <em style=3D"border: 0px; font-size: 14px; = | |
| margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;" = | |
| class=3D"">collection types</em>, known as arrays, sets, and = | |
| dictionaries, for storing collections of values. Arrays are ordered = | |
| collections of values. Sets are unordered collections of unique values. = | |
| Dictionaries are unordered collections of key-value = | |
| associations.</p><figure class=3D"figure" style=3D"border: 0px; = | |
| font-size: 10px; margin: 40px auto; outline: 0px; padding: 0px; = | |
| vertical-align: baseline; text-align: center;"><span class=3D"caption" = | |
| style=3D"border: 0px; font-size: 1.1em; margin: 0px 0px 8px; outline: = | |
| 0px; padding: 0px; vertical-align: baseline; caption-side: top; display: = | |
| block; text-align: left;"></span><img alt=3D"image: = | |
| ../Art/CollectionTypes_intro_2x.png" width=3D"670" height=3D"237" = | |
| style=3D"border: 0px; margin: 0px; outline: 0px; padding: 0px; = | |
| vertical-align: baseline;" apple-inline=3D"yes" = | |
| id=3D"DC1A7630-64B4-4A38-BDEE-2944DC6B2AC3" apple-width=3D"yes" = | |
| apple-height=3D"yes" src=3D"cid:AC935685-1F4E-43F9-B22B-1CBAA547008D" = | |
| class=3D""></figure><p class=3D"para" style=3D"border: 0px; font-size: = | |
| 1.4em; margin: 0px 0px 15px; outline: 0px; padding: 0px; vertical-align: = | |
| baseline; color: rgb(65, 65, 65); line-height: = | |
| 20.299999237060547px;">Arrays, sets, and dictionaries in Swift are = | |
| always clear about the types of values and keys that they can store. = | |
| This means that you cannot insert a value of the wrong type into a = | |
| collection by mistake. It also means you can be confident about the type = | |
| of values you will retrieve from a collection.</p><div class=3D"note" = | |
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| 5px; border-left-style: solid; border-left-color: rgb(233, 233, 233); = | |
| font-size: 1.2em; margin: 30px auto 35px; outline: 0px; padding: 15px = | |
| 15px 7px; vertical-align: baseline; width: 581.390625px;"><a = | |
| name=3D"//apple_ref/doc/uid/TP40014097-CH8-NoLink_62" = | |
| style=3D"background-color: transparent; border: 0px; font-size: 12px; = | |
| margin: -85px 0px 0px; outline: 0px; padding: 85px 0px 0px; = | |
| vertical-align: baseline; display: block; width: 0px; height: 0px; = | |
| color: rgb(0, 136, 204);" class=3D""></a><aside class=3D"aside"><p = | |
| class=3D"aside-title" style=3D"background-color: transparent; border: = | |
| 0px; font-size: 9px; margin: 0px 0px 8px; outline: 0px; padding: 0px; = | |
| vertical-align: baseline; color: rgb(128, 128, 128); letter-spacing: = | |
| 2px; text-transform: uppercase; background-position: initial initial; = | |
| background-repeat: initial initial;">NOTE</p><p class=3D"para" = | |
| style=3D"background-color: transparent; border: 0px; font-size: 0.75rem; = | |
| margin: 0px 0px 8px; outline: 0px; padding: 0px; vertical-align: = | |
| baseline; color: rgb(65, 65, 65); line-height: 17.399999618530273px; = | |
| background-position: initial initial; background-repeat: initial = | |
| initial;">Swift=E2=80=99s array, set, and dictionary types are = | |
| implemented as <em style=3D"background-color: transparent; border: = | |
| 0px; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;" = | |
| class=3D"">generic collections</em>. For more on generic types and = | |
| collections, see <span class=3D"x-name" style=3D"background-color: = | |
| transparent; border: 0px; margin: 0px; outline: 0px; padding: 0px; = | |
| vertical-align: baseline;"><a = | |
| href=3D"https://developer.apple.com/library/ios/documentation/Swift/Concep= | |
| tual/Swift_Programming_Language/Generics.html#//apple_ref/doc/uid/TP400140= | |
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| data-id=3D"//apple_ref/doc/uid/TP40014097-CH26-ID179" = | |
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| outline: 0px; padding: 0px; vertical-align: baseline; color: rgb(0, 136, = | |
| 204); text-decoration: none;" = | |
| class=3D"">Generics</a></span>.</p></aside></div></section><section = | |
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| class=3D""></a></section></body></html>= |
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