Today, a friend recommended an interesting page，A domain name is like：
http://fuckingclosuresyntax.com
In the Swift，All functions are closures，Standard functions are just the most complete closures name with parameters。
All right，The following is the text
asvariable:
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var 闭包名称: (参数类型) -> (返回类型) |
asOptional variable:
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var closureName: ((parameterTypes) -> (returnType))? |
asType alias:
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typealias closureType = (parameterTypes) -> (returnType) |
asconstant:
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let closureName: closureType = { ... } |
asWhen the function call parameters:
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func({(parameterTypes) -> (returnType) in statements}) |
asFunction parameters:
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array.sort({ (item1: Int, item2: Int) -> Bool in return item1 < item2 }) |
asAnd using the parameters of the function type inference:
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array.sort({ (item1, item2) -> Bool in return item1 < item2 }) |
asEstimation function parameters and return type:
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array.sort({ (item1, item2) in return item1 < item2 }) |
asThe last parameter of the function:
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array.sort { (item1, item2) in return item1 < item2 } |
As the last parameter to the functionParameter names and abbreviations:
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array.sort { return $0 < $1 } |
And as a function of the last parameterAnd concluded that the return value:
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array.sort { $0 < $1 } |
As the last parameter to the function,A presence function as a reference:
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array.sort(<) |
As a function parameterWith default capture:
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array.sort({ [unowned self] (item1: Int, item2: Int) -> Bool in return item1 < item2 }) |
As a function parameterWith default parameters to infer the type of capture and return type and:
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array.sort({ [unowned self] in return item1 < item2 }) |
This site does not list ready to use all closures。
Original article written by LogStudio：R0uter's Blog » Interpret：How do I declare the Swift closure?
Reproduced Please keep the source and description link：https://www.logcg.com/archives/1055.html
