{"id":1839,"date":"2015-06-10T10:07:14","date_gmt":"2015-06-10T16:07:14","guid":{"rendered":"http:\/\/jamesonquave.com\/blog\/?p=1839"},"modified":"2015-06-11T10:00:47","modified_gmt":"2015-06-11T16:00:47","slug":"swift-2-whats-new","status":"publish","type":"post","link":"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/","title":{"rendered":"Swift 2 – What’s new"},"content":{"rendered":"

Monday Apple announced Swift 2, and just about everything announced is an extremely welcome change. This post is a summary of Chris Lattner’s discussion in the WWDC video “What’s new in Swift”<\/a>. Now, let’s run through them…<\/p>\n

Fundamentals<\/strong><\/p>\n

enums<\/strong> can now be printed to the console and show the actually value instead of just (enum value). Additionally, println<\/strong> is now just print<\/strong>. If you have ever used log debugging to figure out a problem involving enum values, rejoice!<\/p>\n

I tested this and saw that not only is the enum value is printed, but so is the entire context of when and where the print()<\/strong> function is called.<\/p>\n

<\/p>\n

enums<\/strong> can now support multiple types, so long to Box!<\/p>\n

\r\nenum<T1, T2> {\r\n  case First(T1)\r\n  case Second(T2)\r\n}<\/pre>\n
<\/p>\n
The do keyword:<\/p>\n
\r\ndo {\r\n  \/\/...\r\n} while(someVar<5)\r\n\r\n\/\/ Can now be represented as:\r\nrepeat {\r\n  \/\/...\r\n}\r\n<\/pre>\n
Option Sets can now use a standard Set type in Swift 2.0<\/p>\n
\r\nviewOptions = .Repeat | .CurveEaseIn\r\nviewOptions = nil\r\n\r\n\/\/ Can now be represented as a set:\r\n\r\nviewOptions = [.Repeat, .CurveEaseIn]\r\nviewOptions = []\r\n<\/pre>\n
We can also create our own set types<\/p>\n
(Default implementations in protocols)<\/p>\n
\r\nstruct MyStyle : OptionSetType {\r\n  let rawValue: Int\r\n  static let Bold     = MyStyle(rawValue: 1)\r\n  static let Italic   = MyStyle(rawValue: 2)\r\n}\r\n\r\niStyle.style = []\r\niStyle.style = [.Bold, .Italic]\r\n\r\nif iStyle.style.contains(.Bold) {\r\n  \/\/...\r\n}\r\n<\/pre>\n
Function arguments now behave the same way, regardless of if they are global functions, or methods on a data structure.<\/p>\n
So now, you provide arguments labels on functions by default:<\/p>\n
\r\nfunc myFunc(name: String, age: Int) { ... }\r\n\r\nmyFunc(\"John\", age: 35)\r\n<\/pre>\n
The # syntax is now gone, previously used to make the external argument name the same as the internal argument name.<\/p>\n
In tests, public and internal are visible, via running a special run mode.<\/p>\n
Pattern Matching<\/strong>
\nAdded the guard statement which exits the scope in the else statement.<\/p>\n
\r\nguard let name = json[\"name\"] as? String else {\r\n  return .Second(\"missing name\")\r\n}\r\n\r\n\/\/ You can also combine this is to complex guards\r\nguard let name = json[\"name\"] as? String,\r\n      let year = json[\"year\"] as? Int else\r\n    return .Second(\"bad input\")\r\n}\r\n\/\/ name and year are now String and Int types, not optionals!\r\nreturn .First(name, year)\r\n<\/pre>\n
Switch\/case can now be used with inline if statements<\/p>\n
\r\nswitch bar() {\r\ncase .SomeCase(let value) where value != 42:\r\n  doThing(value)\r\n\r\ndefault: break\r\n}\r\n\r\n\/\/ Can now be represented as\r\nif case .SomeCase(let value) = bar() where value != 42 {\r\n  doSomething(value)\r\n}\r\n<\/pre>\n
for in loops now support boolean filters and full pattern matching<\/p>\n
\r\nfor value in mySequence where value != \"\" {\r\n  doThing(value)\r\n}\r\n\r\nfor case .MyEnumCase(let value) in enumValues {\r\n  doThing(value)\r\n}\r\n<\/pre>\n
<\/p>\n
BONUS: Example of try-catch for JSON vs invalid JSON<\/strong><\/p>\n
\r\nlet jsonString = \"{\\\"name\\\":\\\"Fred\\\", \\\"age\\\":40}\"\r\nlet badJsonString = \"This really isn't valid JSON at all\"\r\n\r\nlet jsonData = jsonString.dataUsingEncoding(NSUTF8StringEncoding)!\r\nlet badJsonData = badJsonString.dataUsingEncoding(NSUTF8StringEncoding)!\r\n\r\ndo {\r\n    \/\/ Try parsing some valid JSON\r\n    let parsed = try NSJSONSerialization.JSONObjectWithData(jsonData, options: NSJSONReadingOptions.AllowFragments)\r\n    print(parsed)\r\n    \r\n    \/\/ Try parsing some invalid JSON\r\n    let otherParsed = try NSJSONSerialization.JSONObjectWithData(badJsonData, options: NSJSONReadingOptions.AllowFragments)\r\n    print(otherParsed)\r\n}\r\ncatch let error as NSError {\r\n    \/\/ Catch fires here, with an NSErrro being thrown from the JSONObjectWithData method\r\n    print(\"A JSON parsing error occurred, here are the details:\\n \\(error)\")\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
Monday Apple announced Swift 2, and just about everything announced is an extremely welcome change. This post is a summary of Chris Lattner’s discussion in the WWDC video “What’s new in Swift”. Now, let’s run through them… Fundamentals enums can now be printed to the console and show the actually value instead of just (enum…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_links_to":"","_links_to_target":""},"categories":[25,10,32,71],"tags":[15,34,33],"yoast_head":"\nSwift 2 - What's new - Jameson Quave<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Swift 2 - What's new - Jameson Quave\" \/>\n<meta property=\"og:description\" content=\"Monday Apple announced Swift 2, and just about everything announced is an extremely welcome change. This post is a summary of Chris Lattner’s discussion in the WWDC video “What’s new in Swift”. Now, let’s run through them… Fundamentals enums can now be printed to the console and show the actually value instead of just (enum...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/\" \/>\n<meta property=\"og:site_name\" content=\"Jameson Quave\" \/>\n<meta property=\"article:published_time\" content=\"2015-06-10T16:07:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2015-06-11T16:00:47+00:00\" \/>\n<meta name=\"author\" content=\"Jameson Quave\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jameson Quave\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/\",\"url\":\"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/\",\"name\":\"Swift 2 - What's new - Jameson Quave\",\"isPartOf\":{\"@id\":\"https:\/\/jamesonquave.com\/blog\/#website\"},\"datePublished\":\"2015-06-10T16:07:14+00:00\",\"dateModified\":\"2015-06-11T16:00:47+00:00\",\"author\":{\"@id\":\"https:\/\/jamesonquave.com\/blog\/#\/schema\/person\/db6184f355c7f4e3b876d0f228c2fcfc\"},\"breadcrumb\":{\"@id\":\"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/jamesonquave.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Swift 2 – What’s new\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/jamesonquave.com\/blog\/#website\",\"url\":\"https:\/\/jamesonquave.com\/blog\/\",\"name\":\"Jameson Quave\",\"description\":\"Using computer technology to educate, and improve lives.\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/jamesonquave.com\/blog\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/jamesonquave.com\/blog\/#\/schema\/person\/db6184f355c7f4e3b876d0f228c2fcfc\",\"name\":\"Jameson Quave\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jamesonquave.com\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/d9786c83345117d560bbeab0e1f26814?s=96&d=retro&r=pg\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/d9786c83345117d560bbeab0e1f26814?s=96&d=retro&r=pg\",\"caption\":\"Jameson Quave\"},\"sameAs\":[\"http:\/\/jamesonquave.com\"],\"url\":\"https:\/\/jamesonquave.com\/blog\/author\/jquave\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Swift 2 - What's new - Jameson Quave","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/","og_locale":"en_US","og_type":"article","og_title":"Swift 2 - What's new - Jameson Quave","og_description":"Monday Apple announced Swift 2, and just about everything announced is an extremely welcome change. This post is a summary of Chris Lattner’s discussion in the WWDC video “What’s new in Swift”. Now, let’s run through them… Fundamentals enums can now be printed to the console and show the actually value instead of just (enum...","og_url":"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/","og_site_name":"Jameson Quave","article_published_time":"2015-06-10T16:07:14+00:00","article_modified_time":"2015-06-11T16:00:47+00:00","author":"Jameson Quave","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Jameson Quave","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/","url":"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/","name":"Swift 2 - What's new - Jameson Quave","isPartOf":{"@id":"https:\/\/jamesonquave.com\/blog\/#website"},"datePublished":"2015-06-10T16:07:14+00:00","dateModified":"2015-06-11T16:00:47+00:00","author":{"@id":"https:\/\/jamesonquave.com\/blog\/#\/schema\/person\/db6184f355c7f4e3b876d0f228c2fcfc"},"breadcrumb":{"@id":"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/jamesonquave.com\/blog\/swift-2-whats-new\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/jamesonquave.com\/blog\/"},{"@type":"ListItem","position":2,"name":"Swift 2 – What’s new"}]},{"@type":"WebSite","@id":"https:\/\/jamesonquave.com\/blog\/#website","url":"https:\/\/jamesonquave.com\/blog\/","name":"Jameson Quave","description":"Using computer technology to educate, and improve lives.","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/jamesonquave.com\/blog\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/jamesonquave.com\/blog\/#\/schema\/person\/db6184f355c7f4e3b876d0f228c2fcfc","name":"Jameson Quave","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jamesonquave.com\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/d9786c83345117d560bbeab0e1f26814?s=96&d=retro&r=pg","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/d9786c83345117d560bbeab0e1f26814?s=96&d=retro&r=pg","caption":"Jameson Quave"},"sameAs":["http:\/\/jamesonquave.com"],"url":"https:\/\/jamesonquave.com\/blog\/author\/jquave\/"}]}},"_links":{"self":[{"href":"https:\/\/jamesonquave.com\/blog\/wp-json\/wp\/v2\/posts\/1839"}],"collection":[{"href":"https:\/\/jamesonquave.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jamesonquave.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jamesonquave.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jamesonquave.com\/blog\/wp-json\/wp\/v2\/comments?post=1839"}],"version-history":[{"count":11,"href":"https:\/\/jamesonquave.com\/blog\/wp-json\/wp\/v2\/posts\/1839\/revisions"}],"predecessor-version":[{"id":1851,"href":"https:\/\/jamesonquave.com\/blog\/wp-json\/wp\/v2\/posts\/1839\/revisions\/1851"}],"wp:attachment":[{"href":"https:\/\/jamesonquave.com\/blog\/wp-json\/wp\/v2\/media?parent=1839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jamesonquave.com\/blog\/wp-json\/wp\/v2\/categories?post=1839"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jamesonquave.com\/blog\/wp-json\/wp\/v2\/tags?post=1839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}