Swift 2.0 Study Notes (day 23)--trailing closures

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A closure expression can be passed as a function parameter, and if the closure expression is long, it affects the readability of the program. A trailing closure is a closure expression that is written after the function brackets, and the function supports calling it as the last argument.

Func Calculate (opr:string, Funn: (int, int) and int) {///last parameter Funn is (int,int)-int function type, Funn can receive closure expression    switch ( OPR) {case    "+":        print ("ten + 5 = \ (Funn (10,5))")    default:        print ("10-5 = \ (Funn (10,5))")    }} Calculat E ("+", Funn: {(A:int, b:int), int in return a + B})  //Call Calculate ("+") {(A:int, b:int), int in return a + B}//Call, this form is the trailing closure calculate ("+") {$ + $}  //Call, this form is the trailing closure package

It is important to note that closures must be the last parameter of the parameter list, if Calculate functions are defined in the following form:

func Calculate (Funn: (Int, Int) ->int, opr:string) {

...

}

Since the closure expression is not the last argument, the call Calculate functions cannot be written using trailing closures.

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Swift 2.0 Study Notes (day 23)--trailing closures