Swift--function

Swift As a high-level language , Function definition introduces Arrow Syntax . Function parameters are optimized , Introduce optional parameters , Variable parameters ; Addressing parameters , restructure , Inlining is optimized .

Hello World

func jjMinus(param1: Int, param2: Int) -> Int {
    
	print("Hello world")
	return param1 - param2
}

1. The parameter modifier of the function assumes by default that let
2. If the code of the a function is only one line ,return The modifier can be omitted