如何收集函数的返回值(Swift 3) [英] How to collect the return value of a function (Swift 3)

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问题描述


我想收集函数的返回值。 问题:
如何在不通过参数的情况下调用'test'函数来收集返回变量'name'?



有没有办法收集变量(值)从函数与agruments(参数),而不通过参数?



我提供了一个例子:

  let userName =Jake
let userInfo = test(name:userName)

func test(name:String) - >字符串{

返回名称
}

//函数调用
//目标:我想在不传递参数的情况下检索函数返回值
让newUser = test()

是否必须存储函数'test'返回值检索它?
我想检索'userName'Jake

解决方案

您可以 return 像下面这样,

  let userName =Jake//类的全局变量
let userInfo = test()// Jake

func test() - >字符串{/ /单元素元组将不会有返回标签。

返回self.userName
}

如果您喜欢返回标签然后您需要拖拽或更多返回值如下所示,

  func test() - > (name:String,age:Int){
return(self.userName,125)
}

通过 test()访问特定的值。name


Goal: I want to collect the return value of a function.

Question: How can I call the 'test' function to collect the return variable 'name' without passing through a parameter?

Is there a way to collect a variable(values) from functions with agruments(parameters) without passing through a parameter?

I have provided an example:

let userName = "Jake"
let userInfo = test(name: userName)

    func test(name: String) -> String {

        return name
    }

    // function call
    // Goal: I want to retrieve the function return value without passing a parameter
    let newUser = test()    

Does the function 'test' return value have to be stored to retrieve it? I want to retrieve the 'userName' Jake

解决方案

You can return like below,

let userName = "Jake" //Global variable of the class
let userInfo = test() //Jake

func test() -> String { //single - element tuple will don't have label for return.

   return self.userName
}

If you like to return with labels then you need tow or more return values like below,

   func test() -> (name:String,age:Int) {        
       return (self.userName,125)
    }

And access specific values by test().name

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