Introduction to value passing in go language

Parameters in Go language can only be passed by value

Value passing is a copying process

Go: Value passing

func bbb(list [4]int){
   for i,_ := range list{
      list[i] = 0
   }
}
func main(){
   list := [4]int{1,2,3,4}
   bbb(list)
   fmt.Println(list )   //[1 2 3 4]
}

Javascript: Reference passing

let list = [1,2,3,4]
function  bbb(list){
    list.forEach((item,index)=>{
        list[index] = 0
    })
}
bbb(list)
console.log(list)   //[0,0,0,0]

But Go language can realize the function of reference passing through pointers

func bbb(p2 *[4]int){    //接受一个[4]int的指针
   for i,_ := range p2{
      p2[i] = 0
   }
}
func main(){
   list := [4]int{1,2,3,4}
   p := &list
   bbb(p)     //传递指针
   fmt.Println(list )   //[0 0 0 0]
}

Since it is said that parameter passing in go language can only be passed by value, So here is actually a copy of the pointer address, and both addresses point to the address of the variable list of the main function, so the value of the list changes

For more related knowledge, please pay attention to go language tutorial column

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