Variable parameters of go

Variable function
Conditions ：
    1、 The last parameter uses ...
    2、 If you put variable parameters before parameters, all parameters will be regarded as variable parameters , Compilation will also report errors syntax error: cannot use … with non-final parameter
    3、 Variable parameters need to use range To cycle
    4、 The variable parameter is actually a slice [] slice
Operation principle ：
    1、 First, variable parameters will be converted to corresponding types slice
    2、 Pass this slice to the function
Variable parameters vs section
    1、 Improve the readability
    2、 Each time you call a function, you need to create a slice , It's not necessary

append Is a variable function

To pass a slice to a variable parameter, you need to set the slice []string{}... Add 3 One point is enough , And there will be no new slices

Code

package main

import "fmt"

/**
*  Variable parameters 
 */
func main() {
    test1(1,2,3,4)
    test2(1,2,3,4)
    t := []int{2,3,4}
    test2(1,t...) // Slice and add ... Can still pass 
}

func test1(a ...int) {
    fmt.Println(a)
}

func test2(a int , b ...int) {
    fmt.Println(a,b)
}

// This definition is , It will report an error 
func test3(b ...int, a int) {

}