https://dmitripavlutin.com/component---src-components-pages-post-f…swift-self-index-md-a7de3dfa74e62d7cba2d.js

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1,n.createElement(t.a,{href:"#1-access-instance-properties-and-methods","aria-label":"1 access instance properties and methods permalink",className:"anchor before"},n.createElement(t.span,{dangerouslySetInnerHTML:{__html:'<svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>'}})),"1. Access instance properties and methods"),"\n",n.createElement(t.p,null,"For example the following structure ",n.createElement(t.code,null,"Weather")," uses ",n.createElement(t.code,null,"self")," in its initializer and ",n.createElement(t.code,null,"isDayForWalk()")," method:"),"\n",n.createElement(c.Code,{codeConfig:a,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"struct ",props:{style:{color:"#C678DD"}}},{content:"Weather",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  let",props:{style:{color:"#C678DD"}}},{content:" windSpeed: ",props:{style:{color:"#ABB2BF"}}},{content:"Int    ",props:{style:{color:"#E5C07B"}}},{content:"// miles per hour",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]},{tokens:[{content:"  let chanceOfRain: ",props:{style:{color:"#ABB2BF"}}},{content:"Int ",props:{style:{color:"#E5C07B"}}},{content:"// percent",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]},{tokens:[{content:"",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  init",props:{style:{color:"#C678DD"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"windSpeed",props:{style:{color:"#61AFEF",fontStyle:"italic"}}},{content:": ",props:{style:{color:"#ABB2BF"}}},{content:"Int",props:{style:{color:"#E5C07B"}}},{content:", ",props:{style:{color:"#ABB2BF"}}},{content:"chanceOfRain",props:{style:{color:"#61AFEF",fontStyle:"italic"}}},{content:": ",props:{style:{color:"#ABB2BF"}}},{content:"Int",props:{style:{color:"#E5C07B"}}},{content:") {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    self",props:{style:{color:"#E5C07B"}}},{content:".",props:{style:{color:"#ABB2BF"}}},{content:"windSpeed",props:{style:{color:"#E06C75"}}},{content:" = windSpeed",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    self",props:{style:{color:"#E5C07B"}}},{content:".",props:{style:{color:"#ABB2BF"}}},{content:"chanceOfRain",props:{style:{color:"#E06C75"}}},{content:" = chanceOfRain",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  func ",props:{style:{color:"#C678DD"}}},{content:"isDayForWalk",props:{style:{color:"#61AFEF"}}},{content:"() -> ",props:{style:{color:"#ABB2BF"}}},{content:"Bool",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    let",props:{style:{color:"#C678DD"}}},{content:" comfortableWindSpeed = ",props:{style:{color:"#ABB2BF"}}},{content:"5",props:{style:{color:"#D19A66"}}}]},{tokens:[{content:"    let",props:{style:{color:"#C678DD"}}},{content:" acceptableChanceOfRain = ",props:{style:{color:"#ABB2BF"}}},{content:"30",props:{style:{color:"#D19A66"}}}]},{tokens:[{content:"    return ",props:{style:{color:"#C678DD"}}},{content:"self",props:{style:{color:"#E5C07B"}}},{content:".",props:{style:{color:"#ABB2BF"}}},{content:"windSpeed",props:{style:{color:"#E06C75"}}},{content:" <= comfortableWindSpeed",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"      && ",props:{style:{color:"#ABB2BF"}}},{content:"self",props:{style:{color:"#E5C07B"}}},{content:".",props:{style:{color:"#ABB2BF"}}},{content:"chanceOfRain",props:{style:{color:"#E06C75"}}},{content:" <= acceptableChanceOfRain",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"// A nice day for a walk",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]},{tokens:[{content:"let",props:{style:{color:"#C678DD"}}},{content:" niceWeather = ",props:{style:{color:"#ABB2BF"}}},{content:"Weather",props:{style:{color:"#61AFEF"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"windSpeed",props:{style:{color:"#61AFEF"}}},{content:": ",props:{style:{color:"#ABB2BF"}}},{content:"4",props:{style:{color:"#D19A66"}}},{content:", ",props:{style:{color:"#ABB2BF"}}},{content:"chanceOfRain",props:{style:{color:"#61AFEF"}}},{content:": ",props:{style:{color:"#ABB2BF"}}},{content:"25",props:{style:{color:"#D19A66"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"print",props:{style:{color:"#56B6C2"}}},{content:"(niceWeather.",props:{style:{color:"#ABB2BF"}}},{content:"isDayForWalk",props:{style:{color:"#61AFEF"}}},{content:"()) ",props:{style:{color:"#ABB2BF"}}},{content:"// => true",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]}],lang:"swift"},annotations:[]}]}

1),"\n",n.createElement(t.p,null,n.createElement(t.code,null,"self")," special property inside ",n.createElement(t.code,null,"init(windSpeed:chanceOfRain:)")," and ",n.createElement(t.code,null,"isDayForWalk()")," is the current instance of ",n.createElement(t.code,null,"Weather")," structure. It allows to set and access the structure properties ",n.createElement(t.code,null,"self.windSpeed")," and ",n.createElement(t.code,null,"self.chanceOfRain"),"."),"\n",n.createElement(t.p,null,"The structure looks nice."),"\n",n.createElement(t.p,null,"Nevertheless accessing every time ",n.createElement(t.code,null,"self")," property may be excessive. The structure initializer and method provide enough context: everything happens inside the structure. Is it possible to get rid of ",n.createElement(t.code,null,"self"),"?"),"\n",n.createElement(t.p,null,"As mentioned in the introduction, Swift encourages you to omit the ",n.createElement(t.code,null,"self")," keyword whenever possible."),"\n",n.createElement(t.p,null,"In the previous example, it is ",n.createElement(t.strong,null,"recommended to remove ",n.createElement(t.code,null,"self"))," from ",n.createElement(t.code,null,"isDayForWalk()")," method. This makes the method shorter:"),"\n",n.createElement(c.Code,{codeConfig:a,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"struct ",props:{style:{color:"#C678DD"}}},{content:"Weather",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  /* ... */",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]},{tokens:[{content:"  func ",props:{style:{color:"#C678DD"}}},{content:"isDayForWalk",props:{style:{color:"#61AFEF"}}},{content:"() -> ",props:{style:{color:"#ABB2BF"}}},{content:"Bool",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    let",props:{style:{color:"#C678DD"}}},{content:" comfortableWindSpeed = ",props:{style:{color:"#ABB2BF"}}},{content:"5",props:{style:{color:"#D19A66"}}}]},{tokens:[{content:"    let",props:{style:{color:"#C678DD"}}},{content:" acceptableChanceOfRain = ",props:{style:{color:"#ABB2BF"}}},{content:"30",props:{style:{color:"#D19A66"}}}]},{tokens:[{content:"    return",props:{style:{color:"#C678DD"}}},{content:" windSpeed <= comfortableWindSpeed",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"      && chanceOfRain <= acceptableChanceOfRain",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]}],lang:"swift"},annotations:[]}]}),"\n",n.createElement(t.p,null,"Because ",n.createElement(t.code,null,"isDayForWalk()")," method is always invoked in the context of ",n.createElement(t.code,null,"Weather"),"'s instance, Swift enables access of ",n.createElement(t.code,null,"windSpeed")," and ",n.createElement(t.code,null,"chanceOfRain")," without ",n.createElement(t.code,null,"self"),"."),"\n",n.createElement(t.p,null,"Inside the initializer ",n.createElement(t.code,null,"init(windSpeed:chanceOfRain:)")," the parameters and structure properties have the same names ",n.createElement(t.code,null,"windSpeed")," and ",n.createElement(t.code,null,"chanceOfRain"),". Contrary to previous case, now you ",n.createElement(t.strong,null,"cannot remove ",n.createElement(t.code,null,"self"))," keyword, because it would create an ambiguity between the parameter and property names."),"\n",n.createElement(t.p,null,n.createElement(t.code,null,"self")," helps making an explicit distinction between parameters (",n.createElement(t.code,null,"windSpeed")," and ",n.createElement(t.code,null,"chanceOfRain")," used without ",n.createElement(t.code,null,"self"),") and structure properties (",n.createElement(t.code,null,"self.windSpeed")," and ",n.createElement(t.code,null,"self.chanceOfRain"),", accessed with ",n.createElement(t.code,null,"self"),")."),"\n",n.createElement(t.p,null,"Let's make an experiment and still remove ",n.createElement(t.code,null,"self")," from the initializer:"),"\n",n.createElement(c.Code,{codeConfig:a,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"struct ",props:{style:{color:"#C678DD"}}},{content:"Weather",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  /* ... */",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]},{tokens:[{content:"  init",props:{style:{color:"#C678DD"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"windSpeed",props:{style:{color:"#61AFEF",fontStyle:"italic"}}},{content:": ",props:{style:{color:"#ABB2BF"}}},{content:"Int",props:{style:{color:"#E5C07B"}}},{content:", ",props:{style:{color:"#ABB2BF"}}},{content:"chanceOfRain",props:{style:{color:"#61AFEF",fontStyle:"italic"}}},{content:": ",props:{style:{color:"#ABB2BF"}}},{content:"Int",props:{style:{color:"#E5C07B"}}},{content:") {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    windSpeed = windSpeed",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    chanceOfRain = chanceOfRain",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  /* ... */",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]}],lang:"swift"},annotations:[]}]}),"\n",n.createElement(t.p,null,"Looking at the assignment ",n.createElement(t.code,null,"windSpeed = windSpeed"),", how Swift can understand which variable is a parameter and which is a property? It's an ambiguity, so Swift plainly decides that you mean only the parameters."),"\n",n.createElement(t.p,null,"As result an error is thrown: ",n.createElement(t.code,null,"cannot assign to value: 'windSpeed' is a 'let' constant"),". It happens because ",n.createElement(t.code,null,"let")," constant is assigned to itself ",n.createElement(t.code,null,"windSpeed = windSpeed"),", which is not allowed."),"\n",n.createElement(t.span,{dangerouslySetInnerHTML:{__html:'<span\n      class="gatsby-resp-image-wrapper"\n      style="position: relative; display: block; margin-left: auto; margin-right: auto; max-width: 560px; "\n    >\n      <a\n    class="gatsby-resp-image-link"\n    href="/static/27053589f3266c8bcf67598b17cd8159/4033b/cat-mirror.jpg"\n    style="display: block"\n    target="_blank"\n    rel="noopener"\n  >\n    <span\n    class="gatsby-resp-image-background-image"\n    style="padding-bottom: 123.57142857142856%; position: relative; bottom: 0; left: 0; background-image: url(\'data:image/jpeg;base64,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

1QEBAQEAAAAAAAAAAAAAAAABABEQ/9oACAEDAQE/EAkNkW8f/8QAFxEAAwEAAAAAAAAAAAAAAAAAAAERIf/aAAgBAgEBPxBso48hD//EACAQAQACAgEEAwAAAAAAAAAAAAERIQAxQRBhcaFRkcH/2gAIAQEAAT8QgAJQ8Fe8FZOTYh7YASUKpeb+8OCxDFOFlR4xJSChyn4wBZQWDOslIJU2e6/3DxKBJJG6w7GZA0PN3uel3+XPU5//2Q==\'); background-size: cover; display: block;"\n  ></span>\n  <img\n        class="gatsby-resp-image-image"\n        alt="Self keyword in Swift"\n        title=""\n        src="/static/27053589f3266c8bcf67598b17cd8159/9605b/cat-mirror.jpg"\n        srcset="/static/27053589f3266c8bcf67598b17cd8159/c496c/cat-mirror.jpg 140w,\n/static/27053589f3266c8bcf67598b17cd8159/cbbf7/cat-mirror.jpg 280w,\n/static/27053589f3266c8bcf67598b17cd8159/9605b/cat-mirror.jpg 560w,\n/static/27053589f3266c8bcf67598b17cd8159/4033b/cat-mirror.jpg 565w"\n        sizes="(max-width: 560px) 100vw, 560px"\n        style="width:100%;height:100%;margin:0;vertical-align:middle;position:absolute;top:0;left:0;"\n        loading="lazy"\n        decoding="async"\n      />\n  </a>\n    </span>'}}),"\n",n.createElement(t.h2,{id:"2-to-be-or-not-to-be",style:{position:"relative"}},n.createElement(t.a,{href:"#2-to-be-or-not-to-be","aria-label":"2 to be or not to be permalink",className:"anchor before"},n.createElement(t.span,{dangerouslySetInnerHTML:{__html:'<svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>'}})),"2. To be, or not to be"),"\n",n.createElement(t.p,null,"There were plenty of discussions about ",n.createElement(t.a,{href:"https://github.com/apple/swift-evolution/blob/master/proposals/0009-require-self-for-accessing-instance-members.md",target:"_blank",rel:"noopener noreferrer"},"the obligatory usage")," of ",n.createElement(t.code,null,"self")," to access properties, or contrary to skip ",n.createElement(t.code,null,"self"),"."),"\n",n.createElement(t.p,null,"The obligatory usage of ",n.createElement(t.code,null,"self")," brings the benefits of consistency and favors clarity over brevity. You can clearly see the difference between the instance properties (that are prefixed with ",n.createElement(t.code,null,"self."),") from locally defined variables. Maybe..."),"\n",n.createElement(t.p,null,"In my opinion, when you have troubles to distinguish instance properties from  local variables within a method: you have a different, deeper problem."),"\n",n.createElement(t.p,null,"When a structure or class has an excessive number of properties (so called ",n.createElement(t.a,{href:"https://en.wikipedia.org/wiki/God_object",target:"_blank",rel:"noopener noreferrer"},"God object"),"), you're probably breaking the ",n.createElement(t.a,{href:"https://en.wikipedia.org/wiki/Single_responsibility_principle",target:"_blank",rel:"noopener noreferrer"},"Single responsibility principle"),".",n.createElement(t.br),"\n","If a method uses a big number of these properties and declares correspondingly many local variables, then such method does too many things. Using an explicit ",n.createElement(t.code,null,"self")," to distinguish ",n.createElement(t.em,null,"somehow")," properties from variables is a temporary workaround for a bad code."),"\n",n.createElement(t.p,null,"It should not be that way."),"\n",n.createElement(t.p,null,"Now imagine a well designed structure or class, which has a single responsibility. It contains only strictly necessary properties. A well written method is performing one determined action and as result its code is simple and obvious.",n.createElement(t.br),"\n","Surely you don't have the problem to distinguish local variables from instance properties in such a method. The usage of ",n.createElement(t.code,null,"self")," may be even discouraged, since your adding to obvious code redundant explanations."),"\n",n.createElement(t.p,null,"So design your classes and structures well, and don't let the methods grow to thousands of lines of code. Then you can omit ",n.createElement(t.code,null,"self")," without difficulties, and your code becomes even more expressive and concise."),"\n",n.createElement(t.h2,{id:"3-access-type-properties-and-methods",style:{position:"relative"}}

1,n.createElement(t.a,{href:"#3-access-type-properties-and-methods","aria-label":"3 access type properties and methods permalink",className:"anchor before"},n.createElement(t.span,{dangerouslySetInnerHTML:{__html:'<svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>'}})),"3. Access type properties and methods"),"\n",n.createElement(t.p,null,n.createElement(t.code,null,"self")," refers to a type (rather than to an instance) when used in a type method."),"\n",n.createElement(t.p,null,"Let's define following ",n.createElement(t.code,null,"Const")," structure with type properties ",n.createElement(t.code,null,"minLimit"),", ",n.createElement(t.code,null,"maxLimit")," and type method ",n.createElement(t.code,null,"getLimitRange()"),":"),"\n",n.createElement(c.Code,{codeConfig:a,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"struct ",props:{style:{color:"#C678DD"}}},{content:"Const",props:{style:{color:"#E5C07B"}}},{content:" {  ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  static let",props:{style:{color:"#C678DD"}}},{content:" minLimit = ",props:{style:{color:"#ABB2BF"}}},{content:"0",props:{style:{color:"#D19A66"}}}]},{tokens:[{content:"  static let",props:{style:{color:"#C678DD"}}},{content:" maxLimit = ",props:{style:{color:"#ABB2BF"}}},{content:"250",props:{style:{color:"#D19A66"}}}]},{tokens:[{content:"  static func ",props:{style:{color:"#C678DD"}}},{content:"getLimitRange",props:{style:{color:"#61AFEF"}}},{content:"() -> ",props:{style:{color:"#ABB2BF"}}},{content:"ClosedRange",props:{style:{color:"#E5C07B"}}},{content:"<",props:{style:{color:"#ABB2BF"}}},{content:"Int",props:{style:{color:"#E5C07B"}}},{content:"> {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    return ",props:{style:{color:"#C678DD"}}},{content:"self",props:{style:{color:"#E5C07B"}}},{content:".",props:{style:{color:"#ABB2BF"}}},{content:"minLimit",props:{style:{color:"#E06C75"}}},{content:"...self.",props:{style:{color:"#ABB2BF"}}},{content:"maxLimit    ",props:{style:{color:"#E06C75"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"print",props:{style:{color:"#56B6C2"}}},{content:"(Const.",props:{style:{color:"#ABB2BF"}}},{content:"getLimitRange",props:{style:{color:"#61AFEF"}}},{content:"()) ",props:{style:{color:"#ABB2BF"}}},{content:"// => 0...250  ",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]}],lang:"swift"},annotations:[]}]}),"\n",n.createElement(t.p,null,"Within the type method ",n.createElement(t.code,null,"getLimitRange()")," the type properties are accessed using ",n.createElement(t.code,null,"self.minLimit")," and ",n.createElement(t.code,null,"self.maxLimit"),". In this case ",n.createElement(t.code,null,"self")," refers to ",n.createElement(t.code,null,"Const")," type directly."),"\n",n.createElement(t.p,null,"Interestingly that you can access type properties using two additional forms."),"\n",n.createElement(t.p,null,"Firstly you can omit ",n.createElement(t.code,null,"self"),", and Swift cleverly deduces you're accessing type properties:"),"\n",n.createElement(c.Code,{codeConfig:a,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"struct ",props:{style:{color:"#C678DD"}}},{content:"Const",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  static let",props:{style:{color:"#C678DD"}}},{content:" minLimit = ",props:{style:{color:"#ABB2BF"}}},{content:"0",props:{style:{color:"#D19A66"}}}]},{tokens:[{content:"  static let",props:{style:{color:"#C678DD"}}},{content:" maxLimit = ",props:{style:{color:"#ABB2BF"}}},{content:"250",props:{style:{color:"#D19A66"}}}]},{tokens:[{content:"  static func ",props:{style:{color:"#C678DD"}}},{content:"getLimitRange",props:{style:{color:"#61AFEF"}}},{content:"() -> ",props:{style:{color:"#ABB2BF"}}},{content:"ClosedRange",props:{style:{color:"#E5C07B"}}},{content:"<",props:{style:{color:"#ABB2BF"}}},{content:"Int",props:{style:{color:"#E5C07B"}}},{content:"> {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    return",props:{style:{color:"#C678DD"}}},{content:" minLimit...",props:{style:{color:"#ABB2BF"}}},{content:"maxLimit",props:{style:{color:"#E06C75"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"print",props:{style:{color:"#56B6C2"}}},{content:"(Const.",props:{style:{color:"#ABB2BF"}}},{content:"getLimitRange",props:{style:{color:"#61AFEF"}}},{content:"()) ",props:{style:{color:"#ABB2BF"}}},{content:"// => 0...250",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]}],lang:"swift"},annotations:[]}]}),"\n",n.createElement(t.p,null,"Secondly you can indicate the type ",n.createElement(t.code,null,"Const")," explicitly when accessing the properties:"),"\n",n.createElement(c.Code,{codeConfig:a,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"struct ",props:{style:{color:"#C678DD"}}},{content:"Const",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  static let",props:{style:{color:"#C678DD"}}},{content:" minLimit = ",props:{style:{color:"#ABB2BF"}}},{content:"0",props:{style:{color:"#D19A66"}}}]},{tokens:[{content:"  static let",props:{style:{color:"#C678DD"}}},{content:" maxLimit = ",props:{style:{color:"#ABB2BF"}}},{content:"250",props:{style:{color:"#D19A66"}}}]},{tokens:[{content:"  static func ",props:{style:{color:"#C678DD"}}},{content:"getLimitRange",props:{style:{color:"#61AFEF"}}},{content:"() -> ",props:{style:{color:"#ABB2BF"}}},{content:"ClosedRange",props:{style:{color:"#E5C07B"}}},{content:"<",props:{style:{color:"#ABB2BF"}}},{content:"Int",props:{style:{color:"#E5C07B"}}},{content:"> {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    return",props:{style:{color:"#C678DD"}}},{content:" Const.",props:{style:{color:"#ABB2BF"}}},{content:"minLimit",props:{style:{color:"#E06C75"}}},{content:"...",props:{style:{color:"#ABB2BF"}}},{content:"Const",props:{style:{color:"#E06C75"}}},{content:".",props:{style:{color:"#ABB2BF"}}},{content:"maxLimit",props:{style:{color:"#E06C75"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"print",props:{style:{color:"#56B6C2"}}},{content:"(Const.",props:{style:{color:"#ABB2BF"}}},{content:"getLimitRange",props:{style:{color:"#61AFEF"}}},{content:"()) ",props:{style:{color:"#ABB2BF"}}},{content:"// => 0...250",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]}],lang:"swift"},annotations:[]}]}

1),"\n",n.createElement(t.p,null,n.createElement(t.code,null,"Const.minLimit")," is my personal preference when accessing type properties. ",n.createElement(t.code,null,"Const")," serves as a namespace that groups constants."),"\n",n.createElement(t.p,null,"I find great that Swift allows 3 ways to access static properties. Use the one you like!"),"\n",n.createElement(t.h2,{id:"4-access-instance-properties-and-methods-in-a-closure",style:{position:"relative"}},n.createElement(t.a,{href:"#4-access-instance-properties-and-methods-in-a-closure","aria-label":"4 access instance properties and methods in a closure permalink",className:"anchor before"},n.createElement(t.span,{dangerouslySetInnerHTML:{__html:'<svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>'}})),"4. Access instance properties and methods in a closure"),"\n",n.createElement(t.p,null,"A closure is a block of code that can be referenced, passed around and invoked when necessary. A closure has access to variables from the environment where it was defined, also called the closure scope."),"\n",n.createElement(t.p,null,"Sometimes you need to define a closure in a method. The closure can access the local method variables. What's more important you have to explicitly write ",n.createElement(t.code,null,"self")," to access instance properties or methods within the closure."),"\n",n.createElement(t.p,null,"Let's define a closure inside a method:"),"\n",n.createElement(c.Code,{codeConfig:a,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"class ",props:{style:{color:"#C678DD"}}},{content:"Collection",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  var",props:{style:{color:"#C678DD"}}},{content:" numbers: [",props:{style:{color:"#ABB2BF"}}},{content:"Int",props:{style:{color:"#E5C07B"}}},{content:"]",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  init",props:{style:{color:"#C678DD"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"from ",props:{style:{color:"#61AFEF"}}},{content:"numbers",props:{style:{color:"#ABB2BF",fontStyle:"italic"}}},{content:": [",props:{style:{color:"#ABB2BF"}}},{content:"Int",props:{style:{color:"#E5C07B"}}},{content:"]) {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    self",props:{style:{color:"#E5C07B"}}},{content:".",props:{style:{color:"#ABB2BF"}}},{content:"numbers",props:{style:{color:"#E06C75"}}},{content:" = numbers",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  func ",props:{style:{color:"#C678DD"}}},{content:"getAppendClosure",props:{style:{color:"#61AFEF"}}},{content:"() -> (",props:{style:{color:"#ABB2BF"}}},{content:"Int",props:{style:{color:"#E5C07B"}}},{content:") -> ",props:{style:{color:"#ABB2BF"}}},{content:"Void",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    return",props:{style:{color:"#C678DD"}}},{content:" { ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"      self",props:{style:{color:"#E5C07B"}}},{content:".",props:{style:{color:"#ABB2BF"}}},{content:"numbers",props:{style:{color:"#E06C75"}}},{content:".",props:{style:{color:"#ABB2BF"}}},{content:"append",props:{style:{color:"#56B6C2"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"$0",props:{style:{color:"#E5C07B"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    }            ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"var",props:{style:{color:"#C678DD"}}},{content:" primes = ",props:{style:{color:"#ABB2BF"}}},{content:"Collection",props:{style:{color:"#E5C07B"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"from",props:{style:{color:"#61AFEF"}}},{content:": [",props:{style:{color:"#ABB2BF"}}},{content:"2",props:{style:{color:"#D19A66"}}},{content:", ",props:{style:{color:"#ABB2BF"}}},{content:"3",props:{style:{color:"#D19A66"}}},{content:", ",props:{style:{color:"#ABB2BF"}}},{content:"5",props:{style:{color:"#D19A66"}}},{content:"])",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"let",props:{style:{color:"#C678DD"}}},{content:" appendToPrimes = primes.",props:{style:{color:"#ABB2BF"}}},{content:"getAppendClosure",props:{style:{color:"#61AFEF"}}},{content:"()",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"appendToPrimes",props:{style:{color:"#61AFEF"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"7",props:{style:{color:"#D19A66"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"appendToPrimes",props:{style:{color:"#61AFEF"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"11",props:{style:{color:"#D19A66"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"print",props:{style:{color:"#56B6C2"}}},{content:"(primes.",props:{style:{color:"#ABB2BF"}}},{content:"numbers",props:{style:{color:"#E06C75"}}},{content:") ",props:{style:{color:"#ABB2BF"}}},{content:"// => [2, 3, 5, 7, 11]",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]}],lang:"swift"},annotations:[]}]}

1),"\n",n.createElement(t.p,null,n.createElement(t.code,null,"Collection")," is a class that holds some prime numbers.",n.createElement(t.br),"\n","The method ",n.createElement(t.code,null,"getAppendClosure()")," returns a closure that when invoked appends a new number to the collection. To access ",n.createElement(t.code,null,"numbers")," property within the closure ",n.createElement(t.strong,null,"you have to explicitly use ",n.createElement(t.code,null,"self"))," keyword: ",n.createElement(t.code,null,"{ self.numbers.append($0) }")," ."),"\n",n.createElement(t.p,null,"The explicit use of ",n.createElement(t.code,null,"self")," in a closure is an intentional design. Because closure captures the scope variables, including ",n.createElement(t.code,null,"self")," reference, you may create a ",n.createElement(t.a,{href:"https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/AutomaticReferenceCounting.html#//apple_ref/doc/uid/TP40014097-CH20-ID56",target:"_blank",rel:"noopener noreferrer"},"strong reference cycle")," between the closure and ",n.createElement(t.code,null,"self"),". And you should beware of this potential problem."),"\n",n.createElement(t.p,null,"To create a strong reference cycle, the common scenario is when a property of an instance is a closure that captures the instance itself. Let's see a sample:"),"\n",n.createElement(c.Code,{codeConfig:a,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"class ",props:{style:{color:"#C678DD"}}},{content:"Person",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  let",props:{style:{color:"#C678DD"}}},{content:" name: ",props:{style:{color:"#ABB2BF"}}},{content:"String",props:{style:{color:"#E5C07B"}}}]},{tokens:[{content:"  lazy var",props:{style:{color:"#C678DD"}}},{content:" sayMyName: () -> ",props:{style:{color:"#ABB2BF"}}},{content:"String",props:{style:{color:"#E5C07B"}}},{content:" = {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"     return ",props:{style:{color:"#C678DD"}}},{content:"self",props:{style:{color:"#E5C07B"}}},{content:".",props:{style:{color:"#ABB2BF"}}},{content:"name   ",props:{style:{color:"#E06C75"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  init",props:{style:{color:"#C678DD"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"withName ",props:{style:{color:"#61AFEF"}}},{content:"name",props:{style:{color:"#ABB2BF",fontStyle:"italic"}}},{content:": ",props:{style:{color:"#ABB2BF"}}},{content:"String",props:{style:{color:"#E5C07B"}}},{content:") {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    self",props:{style:{color:"#E5C07B"}}},{content:".",props:{style:{color:"#ABB2BF"}}},{content:"name",props:{style:{color:"#E06C75"}}},{content:" = name",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  deinit",props:{style:{color:"#C678DD"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    print",props:{style:{color:"#56B6C2"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:'"Person deinitialized"',props:{style:{color:"#98C379"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"var",props:{style:{color:"#C678DD"}}},{content:" leader: Person? ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"leader = ",props:{style:{color:"#ABB2BF"}}},{content:"Person",props:{style:{color:"#61AFEF"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"withName",props:{style:{color:"#61AFEF"}}},{content:": ",props:{style:{color:"#ABB2BF"}}},{content:'"John Connor"',props:{style:{color:"#98C379"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"if let",props:{style:{color:"#C678DD"}}},{content:" leader = leader {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  print",props:{style:{color:"#56B6C2"}}},{content:"(leader.",props:{style:{color:"#ABB2BF"}}},{content:"sayMyName",props:{style:{color:"#61AFEF"}}},{content:"())   ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"leader = ",props:{style:{color:"#ABB2BF"}}},{content:"nil",props:{style:{color:"#D19A66"}}}]}],lang:"swift"},annotations:[]}]}),"\n",n.createElement(t.p,null,"When the variable ",n.createElement(t.code,null,"leader")," is assigned with ",n.createElement(t.code,null,"nil"),", normally the instance should be deinitianilazied. You can expect ",n.createElement(t.code,null,"deinit")," method to be called that prints ",n.createElement(t.code,null,'"Person deinitialized"')," message. However this does not happen."),"\n",n.createElement(t.p,null,"The strong reference cycle creates the problem."),"\n",n.createElement(t.span,{dangerouslySetInnerHTML:{__html:'<span\n      class="gatsby-resp-image-wrapper"\n      style="position: relative; display: block; margin-left: auto; margin-right: auto; max-width: 560px; "\n    >\n      <a\n    class="gatsby-resp-image-link"\n    href="/static/00059e4ec42ea2588abf46a95735ba2c/f292f/two-cats.jpg"\n    style="display: block"\n    target="_blank"\n    rel="noopener"\n  >\n    <span\n    class="gatsby-resp-image-background-image"\n    style="padding-bottom: 76.42857142857143%; position: relative; bottom: 0; left: 0; background-image: url(\'data:image/jpeg;base64,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\'); background-size: cover; display: block;"\n  ></span>\n  <img\n        class="gatsby-resp-image-image"\n        alt="Two lazy cats like a strong reference cycle"\n        title=""\n        src="/static/00059e4ec42ea2588abf46a95735ba2c/9605b/two-cats.jpg"\n        srcset="/static/00059e4ec42ea2588abf46a95735ba2c/c496c/two-cats.jpg 140w,\n/static/00059e4ec42ea2588abf46a95735ba2c/cbbf7/two-cats.jpg 280w,\n/static/00059e4ec42ea2588abf46a95735ba2c/9605b/two-cats.jpg 560w,\n/static/00059e4ec42ea2588abf46a95735ba2c/f292f/two-cats.jpg 671w"\n        sizes="(max-width: 560px) 100v

1w, 560px"\n        style="width:100%;height:100%;margin:0;vertical-align:middle;position:absolute;top:0;left:0;"\n        loading="lazy"\n        decoding="async"\n      />\n  </a>\n    </span>'}}),"\n",n.createElement(t.p,null,"The instance holds the closure reference ",n.createElement(t.code,null,"leader.sayMyName")," and simultaneously the closure captures and holds the instance reference ",n.createElement(t.code,null,"{ return self.name }"),". Under such circumstances the reference cycle cannot be broken and as result both ",n.createElement(t.code,null,"leader")," instance and the closure cannot be deallocated."),"\n",n.createElement(t.p,null,"The solution is to define inside the closure a capture list and mark ",n.createElement(t.code,null,"self")," as an ",n.createElement(t.code,null,"unowned")," reference. Let's fix the previous example:"),"\n",n.createElement(c.Code,{codeConfig:a,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"class ",props:{style:{color:"#C678DD"}}},{content:"Person",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  /* ... */",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]},{tokens:[{content:"  lazy var",props:{style:{color:"#C678DD"}}},{content:" sayMyName: () -> ",props:{style:{color:"#ABB2BF"}}},{content:"String",props:{style:{color:"#E5C07B"}}},{content:" = { ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"     [",props:{style:{color:"#ABB2BF"}}},{content:"unowned ",props:{style:{color:"#C678DD"}}},{content:"self",props:{style:{color:"#E5C07B"}}},{content:"] ",props:{style:{color:"#ABB2BF"}}},{content:"in",props:{style:{color:"#C678DD"}}}]},{tokens:[{content:"     return ",props:{style:{color:"#C678DD"}}},{content:"self",props:{style:{color:"#E5C07B"}}},{content:".",props:{style:{color:"#ABB2BF"}}},{content:"name   ",props:{style:{color:"#E06C75"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  /* ... */",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]},{tokens:[{content:"  deinit",props:{style:{color:"#C678DD"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    print",props:{style:{color:"#56B6C2"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:'"Person deinitialized"',props:{style:{color:"#98C379"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"var",props:{style:{color:"#C678DD"}}},{content:" leader: Person? ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"leader = ",props:{style:{color:"#ABB2BF"}}},{content:"Person",props:{style:{color:"#61AFEF"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"withName",props:{style:{color:"#61AFEF"}}},{content:": ",props:{style:{color:"#ABB2BF"}}},{content:'"John Connor"',props:{style:{color:"#98C379"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"if let",props:{style:{color:"#C678DD"}}},{content:" leader = leader {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  print",props:{style:{color:"#56B6C2"}}},{content:"(leader.",props:{style:{color:"#ABB2BF"}}},{content:"sayMyName",props:{style:{color:"#61AFEF"}}},{content:"())   ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"leader = ",props:{style:{color:"#ABB2BF"}}},{content:"nil",props:{style:{color:"#D19A66"}}}]},{tokens:[{content:'// => "Person deinitialized"',props:{style:{color:"#7F848E",fontStyle:"italic"}}}]}],lang:"swift"},annotations:[]}]}),"\n",n.createElement(t.p,null,"Notice that ",n.createElement(t.code,null,"[unowned self]")," is added in the closure, which marks ",n.createElement(t.code,null,"self")," as an unowned reference. Now the closure does not keep a strong reference to ",n.createElement(t.code,null,"self")," instance. The strong reference cycle between instance and closure is no longer created."),"\n",n.createElement(t.p,null,"Since ",n.createElement(t.code,null,"leader")," instance is not necessary ",n.createElement(t.code,null,"leader = nil"),", the memory is deallocated correctly. The deinitializer ",n.createElement(t.code,null,"deinit")," is called as expected, which prints ",n.createElement(t.code,null,'"Person deinitialized"')," message to the console."),"\n",n.createElement(t.p,null,"I recommend  to read more about instances lifetime at ",n.createElement(t.a,{href:"https://www.uraimo.com/2016/10/27/unowned-or-weak-lifetime-and-performance/",target:"_blank",rel:"noopener noreferrer"},"Unowned or Weak? Lifetime and Performance"),"."),"\n",n.createElement(t.p,null,

1n.createElement(t.strong,null,"Important.")," When you access ",n.createElement(t.code,null,"self")," in a closure, you should ",n.createElement(t.em,null,"always")," verify whether a strong reference cycle is not created."),"\n",n.createElement(t.h2,{id:"4-individual-self-usage",style:{position:"relative"}},n.createElement(t.a,{href:"#4-individual-self-usage","aria-label":"4 individual self usage permalink",className:"anchor before"},n.createElement(t.span,{dangerouslySetInnerHTML:{__html:'<svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>'}})),"4. Individual self usage"),"\n",n.createElement(t.p,null,"Of course there are plenty of situations when you need to return or modify ",n.createElement(t.code,null,"self")," directly. Let's enumerate the common scenarios."),"\n",n.createElement(t.h3,{id:"method-chaining",style:{position:"relative"}},n.createElement(t.a,{href:"#method-chaining","aria-label":"method chaining permalink",className:"anchor before"},n.createElement(t.span,{dangerouslySetInnerHTML:{__html:'<svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>'}})),"Method chaining"),"\n",n.createElement(t.p,null,"When working with classes, you might want to implement a ",n.createElement(t.a,{href:"https://en.wikipedia.org/wiki/Method_chaining",target:"_blank",rel:"noopener noreferrer"},"method chaining"),". Such practice is useful to chain multiple method calls on the same instance, without storing the intermediate results."),"\n",n.createElement(t.p,null,"The following example is implementing a simple Stack data structure. You can ",n.createElement(t.em,null,"push")," or ",n.createElement(t.em,null,"pop")," elements in the stack. Let's take a look:"),"\n",n.createElement(c.Code,{codeConfig:a,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"class ",props:{style:{color:"#C678DD"}}},{content:"Stack",props:{style:{color:"#E5C07B"}}},{content:"<",props:{style:{color:"#ABB2BF"}}},{content:"Element",props:{style:{color:"#E5C07B"}}},{content:"> {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  fileprivate var",props:{style:{color:"#C678DD"}}},{content:" elements = [",props:{style:{color:"#ABB2BF"}}},{content:"Element",props:{style:{color:"#E5C07B"}}},{content:"]()",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  @discardableResult",props:{style:{color:"#C678DD"}}}]},{tokens:[{content:"  func ",props:{style:{color:"#C678DD"}}},{content:"push",props:{style:{color:"#61AFEF"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"_ ",props:{style:{color:"#61AFEF"}}},{content:"element",props:{style:{color:"#ABB2BF",fontStyle:"italic"}}},{content:": ",props:{style:{color:"#ABB2BF"}}},{content:"Element",props:{style:{color:"#E5C07B"}}},{content:") -> Stack {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    elements.",props:{style:{color:"#ABB2BF"}}},{content:"append",props:{style:{color:"#56B6C2"}}},{content:"(element)",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    return ",props:{style:{color:"#C678DD"}}},{content:"self",props:{style:{color:"#E5C07B"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  func ",props:{style:{color:"#C678DD"}}},{content:"pop",props:{style:{color:"#61AFEF"}}},{content:"() -> ",props:{style:{color:"#ABB2BF"}}},{content:"Element",props:{style:{color:"#E5C07B"}}},{content:"? {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    return",props:{style:{color:"#C678DD"}}},{content:" elements.",props:{style:{color:"#ABB2BF"}}},{content:"popLast",props:{style:{color:"#56B6C2"}}},{content:"()",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  func ",props:{style:{color:"#C678DD"}}},{content:"printElements",props:{style:{color:"#61AFEF"}}},{content:"() {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    print",props:{style:{color:"#56B6C2"}}},{content:"(elements)",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"var",props:{style:{color:"#C678DD"}}},{content:" numbers = Stack<",props:{style:{color:"#ABB2BF"}}},{content:"Int",props:{style:{color:"#E5C07B"}}},{content:">()",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"numbers",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  .",props:{style:{color:"#ABB2BF"}}},{content:"push",props:{style:{color:"#61AFEF"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"8",props:{style:{color:"#D19A66"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  .",props:{style:{color:"#ABB2BF"}}},{content:"push",props:{style:{color:"#61AFEF"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"10",props:{style:{color:"#D19A66"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  .",props:{style:{color:"#ABB2BF"}}},{content:"push",props:{style:{color:"#61AFEF"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"2",props:{style:{color:"#D19A66"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"numbers.",props:{style:{color:"#ABB2BF"}}},{content:"printElements",props:{style:{color:"#61AFEF"}}},{content:"() ",props:{style:{color:"#ABB2BF"}}},{content:"// => [8, 10, 2]",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]}],lang:"swift"},annotations:[]}]}),"\n",n.createElement(t.p,null,"The method ",n.createElement(t.code,null,"push(:)")," returns the current instance ",n.createElement(t.code,null,"self"),". This enables the method chaining calls to push multiple elements ",n.createElement(t.code,null,"8"),", ",n.createElement(t.code,null,"10")," and ",n.createElement(t.code,null,"2")," at once into the stack.\nNotice that ",n.createElement(t.code,null,"@discardableResult")," attribute for ",n.createElement(t.code,null,"push(:)")," method suppresses the warning that the result of the last method call in the chain is unused."),"\n",n.createElement(t.h3,{id:"enumeration-case",style:{position:"relative"}}

1,n.createElement(t.a,{href:"#enumeration-case","aria-label":"enumeration case permalink",className:"anchor before"},n.createElement(t.span,{dangerouslySetInnerHTML:{__html:'<svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>'}})),"Enumeration case"),"\n",n.createElement(t.p,null,"To find what case holds the enumeration within its method, you can easily query ",n.createElement(t.code,null,"self")," property with a ",n.createElement(t.code,null,"switch")," statement."),"\n",n.createElement(t.p,null,"For example, let's get a string message that describes the enumeration cases:"),"\n",n.createElement(c.Code,{codeConfig:a,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"enum ",props:{style:{color:"#C678DD"}}},{content:"Activity",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  case",props:{style:{color:"#C678DD"}}},{content:" sleep",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  case",props:{style:{color:"#C678DD"}}},{content:" code",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  case",props:{style:{color:"#C678DD"}}},{content:" learn",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  case",props:{style:{color:"#C678DD"}}},{content:" procrastinate",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  func ",props:{style:{color:"#C678DD"}}},{content:"getOccupation",props:{style:{color:"#61AFEF"}}},{content:"() -> ",props:{style:{color:"#ABB2BF"}}},{content:"String",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    switch ",props:{style:{color:"#C678DD"}}},{content:"self",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"      case",props:{style:{color:"#C678DD"}}},{content:" .",props:{style:{color:"#ABB2BF"}}},{content:"sleep",props:{style:{color:"#E06C75"}}},{content:":",props:{style:{color:"#C678DD"}}}]},{tokens:[{content:"        return ",props:{style:{color:"#C678DD"}}},{content:'"Sleeping"',props:{style:{color:"#98C379"}}}]},{tokens:[{content:"      case",props:{style:{color:"#C678DD"}}},{content:" .",props:{style:{color:"#ABB2BF"}}},{content:"code",props:{style:{color:"#E06C75"}}},{content:":",props:{style:{color:"#C678DD"}}}]},{tokens:[{content:"        return ",props:{style:{color:"#C678DD"}}},{content:'"Coding"',props:{style:{color:"#98C379"}}}]},{tokens:[{content:"      case",props:{style:{color:"#C678DD"}}},{content:" .",props:{style:{color:"#ABB2BF"}}},{content:"learn",props:{style:{color:"#E06C75"}}},{content:":",props:{style:{color:"#C678DD"}}}]},{tokens:[{content:"        return ",props:{style:{color:"#C678DD"}}},{content:'"Reading a book"',props:{style:{color:"#98C379"}}}]},{tokens:[{content:"      default:",props:{style:{color:"#C678DD"}}}]},{tokens:[{content:"        return ",props:{style:{color:"#C678DD"}}},{content:'"Enjoying laziness"',props:{style:{color:"#98C379"}}}]},{tokens:[{content:"    }    ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"let",props:{style:{color:"#C678DD"}}},{content:" improving = Activity.",props:{style:{color:"#ABB2BF"}}},{content:"learn",props:{style:{color:"#E06C75"}}}]},{tokens:[{content:"print",props:{style:{color:"#56B6C2"}}},{content:"(improving.",props:{style:{color:"#ABB2BF"}}},{content:"getOccupation",props:{style:{color:"#61AFEF"}}},{content:"()) ",props:{style:{color:"#ABB2BF"}}},{content:'// => "Reading a book"',props:{style:{color:"#7F848E",fontStyle:"italic"}}}]}],lang:"swift"},annotations:[]}]}),"\n",n.createElement(t.p,null,"The method ",n.createElement(t.code,null,"getOccupation()")," accesses ",n.createElement(t.code,null,"self")," to determine the current enumeration case."),"\n",n.createElement(t.h3,{id:"new-structure-instance",style:{position:"relative"}}

1,n.createElement(t.a,{href:"#new-structure-instance","aria-label":"new structure instance permalink",className:"anchor before"},n.createElement(t.span,{dangerouslySetInnerHTML:{__html:'<svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>'}})),"New structure instance"),"\n",n.createElement(t.p,null,"In a structure you can dynamically modify the current instance by assigning to ",n.createElement(t.code,null,"self")," a new value:"),"\n",n.createElement(c.Code,{codeConfig:a,northPanel:{tabs:[""],active:"",heightRatio:1},files:[{name:"",focus:"",code:{lines:[{tokens:[{content:"struct ",props:{style:{color:"#C678DD"}}},{content:"Movement",props:{style:{color:"#E5C07B"}}},{content:" {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  var",props:{style:{color:"#C678DD"}}},{content:" speed: ",props:{style:{color:"#ABB2BF"}}},{content:"Int",props:{style:{color:"#E5C07B"}}}]},{tokens:[{content:"",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  mutating func ",props:{style:{color:"#C678DD"}}},{content:"stop",props:{style:{color:"#61AFEF"}}},{content:"() {",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"    self",props:{style:{color:"#E5C07B"}}},{content:" = ",props:{style:{color:"#ABB2BF"}}},{content:"Movement",props:{style:{color:"#61AFEF"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"speed",props:{style:{color:"#61AFEF"}}},{content:": ",props:{style:{color:"#ABB2BF"}}},{content:"0",props:{style:{color:"#D19A66"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"  }",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"}",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"var",props:{style:{color:"#C678DD"}}},{content:" run = ",props:{style:{color:"#ABB2BF"}}},{content:"Movement",props:{style:{color:"#61AFEF"}}},{content:"(",props:{style:{color:"#ABB2BF"}}},{content:"speed",props:{style:{color:"#61AFEF"}}},{content:": ",props:{style:{color:"#ABB2BF"}}},{content:"20",props:{style:{color:"#D19A66"}}},{content:")",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"print",props:{style:{color:"#56B6C2"}}},{content:"(run.",props:{style:{color:"#ABB2BF"}}},{content:"speed",props:{style:{color:"#E06C75"}}},{content:") ",props:{style:{color:"#ABB2BF"}}},{content:"// => 20",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]},{tokens:[{content:"run.",props:{style:{color:"#ABB2BF"}}},{content:"stop",props:{style:{color:"#61AFEF"}}},{content:"() ",props:{style:{color:"#ABB2BF"}}}]},{tokens:[{content:"print",props:{style:{color:"#56B6C2"}}},{content:"(run.",props:{style:{color:"#ABB2BF"}}},{content:"speed",props:{style:{color:"#E06C75"}}},{content:") ",props:{style:{color:"#ABB2BF"}}},{content:"// => 0",props:{style:{color:"#7F848E",fontStyle:"italic"}}}]}],lang:"swift"},annotations:[]}]}),"\n",n.createElement(t.p,null,"In the mutating method ",n.createElement(t.code,null,"stop()")," the assignment ",n.createElement(t.code,null,"self = Movement(speed: 0)")," modifies the current instance to a new one."),"\n",n.createElement(t.h2,{id:"5-conclusion",style:{position:"relative"}},n.createElement(t.a,{href:"#5-conclusion","aria-label":"5 conclusion permalink",className:"anchor before"},n.createElement(t.span,{dangerouslySetInnerHTML:{__html:'<svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>'}}

1)),"5. Conclusion"),"\n",n.createElement(t.p,null,n.createElement(t.code,null,"self")," is a property on the instance that refers to itself. It's used to access class, structure and enumeration instance within methods."),"\n",n.createElement(t.p,null,"When ",n.createElement(t.code,null,"self")," is accessed in a type method (",n.createElement(t.code,null,"static func")," or ",n.createElement(t.code,null,"class func"),"), it refers to the actual type (rather than an instance)."),"\n",n.createElement(t.p,null,"Swift allows to omit ",n.createElement(t.code,null,"self")," when you want to access instances properties. My advice is to rely on shortness and skip ",n.createElement(t.code,null,"self")," whenever possible."),"\n",n.createElement(t.p,null,"When a method parameter have the same name as instance property, you have to explicitly use ",n.createElement(t.code,null,"self.myVariable = myVariable")," to make a distinction.",n.createElement(t.br),"\n","Notice that method parameters have a priority over instance properties."),"\n",n.createElement(t.p,null,n.createElement(t.em,null,"Do you think ",n.createElement(t.code,null,"self")," should be omitted or kept? Feel free to write your opinion in the comments section below!")))}var i=function(e){void 0===e&&(e={});const{wrapper:t}=Object.assign({},(0,r.ah)(),e.components);return t?n.createElement(t,e,n.createElement(l,e)):l(e)};function p(e,t){throw new Error("Expected "+(t?"component":"object")+" `"+e+"` to be defined: you likely forgot to import, pass, or provide it.")}var d=o(12),u=o(5319),m=o(5893);function g(e){let{data:t,children:o}=e;const{featured:{popularPostsByCategory:n}}=t.site.siteMetadata,{mdx:r,popularPostsMarkdown:s}=t,c={...r.frontmatter,children:o,thumbnail:r.frontmatter.thumbnail.childImageSharp.gatsbyImageData,tableOfContents:r.tableOfContents},a=r.internal.contentFilePath.split("/").slice(-3).join("/"),l=s.edges.map(u.sN),i=n.map((e=>{let{category:t,slugs:o}=e;return{category:t,plainPosts:o.map((e=>l.find((t=>{let{slug:o}=t;return e===o}))))}}));return(0,m.jsx)(d.Z,{postRelativePath:a,post:c,popularPostsByCategory:i})}function y(e){return n.createElement(g,e,n.createElement(i,e))}}}]);