Go function Summary (GO)

This is a creation in Article, where the information may have evolved or changed.

The Go language function is a little bit different from C,java and so on, roughly as follows:

Definition of a function

For example:

Func Max (A, b int) int{//returns the largest one within a, and note how the function's arguments and return value types are defined    if b>a{        return b    }    return a}

Second, multi-value return

A function in the go language can have multiple return values.

One of the simplest examples

Package Mainimport (    "FMT") var a intfunc main () {    b: = []byte{1, 2, 3, 4}    var x int. for    I: = 0; I << /SPAN> Len (b); {        x, i = Nextint (b, i)//The return result of the final i is Len (b)        FMT.  PRINTLN (x)    }}func nextint (b []byte, I int) (int, int) {    x: = 0 for    ; I <</SPAN> Len (b); i++ {        x = x*10 + int (b[i])    }    return x, i} The result is: 1234

Three, variable function parameters

Examples are as follows:

Package Mainimport (    "FMT") func main () {    sum (1, 2)    sum (1, 2, 3)    //pass array    nums: = []int{1, 2, 3, 4}
  sum (Nums ...)} Func sum (nums ... int) {    fmt. Print (Nums, "")//output such as [1, 2, 3] array    total: = 0 for    _, num: = range Nums {//want to be a value instead of subscript total        + = num    }    FMT. Println (Total)}

Four, function closure

Nextnum This function returns an anonymous function that remembers the value of I+j in Nextnum and changes the value of i,j, thus forming a closure usage with the following code:

Package Mainimport (    "FMT") func Nextnum () func () int {    I, J: = 1, 1    return func () int {        var tmp = i + j
  i, J = j, tmp        return tmp    }}//main function is a call to Nextnum, which is mainly to play the next Fibonacci number Func main () {    Nextnumfunc: = Nextnum () C11/>for I: = 0; I <</SPAN> 10; i++ {        FMT. Println (Nextnumfunc ())    }}

V. Named return value

Fan () is a function of factorial, and its return value parameters and types are declared when the function is defined. The code is as follows:

Package Mainimport (    "FMT") func main () {    fmt. Println (Fan (5))//factorial}func fan (x int) for output 5 (result int) {//return value = result int type    if x = = 0 | | x = = 1 {        result = 1    } el se {        result = x * Fan (x-1)    }    return//Returns the result in this case}