4. Golang function

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The basic composition of the function:

• The keyword func
• Name of function
• Parameter list
• return value
• function body
• Return statement
  The GO function does not support overloading, default parameter values, variable length arguments, multiple return values, and so on.

func main() {        /* 定义局部变量 */        var a, b = 4, 5s := add(a,b)fmt.Println(s)}func add(a, b int) int {return a + b}

Note: A function that starts with a lowercase letter is visible only within this package, and a function that begins with a capital letter can be used by another package.
Indefinite parameter type function: The number of arguments passed in by the function is variable

func main() {myFunc(1,2,3)}func myFunc(args ...int)  {for _,arg := range args {fmt.Println(arg)}}

Anonymous functions (a function implementation that does not need to define function names)

An anonymous function consists of a function and function body without a function name, which can be directly assigned to a variable or executed directly.

f := func(a, b int) int {return a * b}

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