0x00 Lesson
We wrote our square() function like this:
func square(number: Int) -> Int {
return number * number
}That names its parameter number, so we can use number inside the function to refer to it, but we must also use the name when running the function, like this:
let result = square(number: 8)
Swift lets us provide two names for each parameter: one to be used externally when calling the function, and one to be used internally inside the function. This is as simple as writing two names, separated by a space.
To demonstrate this, here’s a function that uses two names for its string parameter:
func sayHello(to name: String) {
print("Hello, \ (name)!")
}The parameter is called to name, which means externally it’s called to, but internally it’s called name. This gives variables a sensible name inside the function, but means calling the function reads naturally:
sayHello(to: "Taylor")
0x01 我的小作品
欢迎体验我的作品之一：小五笔 五笔学习好帮手
App Store 搜索即可~
