将指针传递给Golang中的字符串数组[重复]

Question

This question already has an answer here:

• Slicing a slice pointer passed as argument 1 answer

I am trying to pass string array to the function, print values, modify it and then as the function is finished print value of the string array.

Here is my sample code which does not work but present what i want to achive:

package main
import (
    "fmt"
)
func SendData(a *[]string) {
    fmt.Println(*a)
    *a = *a[:0]
}
func main() {
    var s []string
    s = append(s, "dat","boi")
    SendData(&s)
    fmt.Println(s)
}

This is the error at compilation: cannot slice a (type *[]string)

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Answer 1

To fix the error, just change *a[:0] to (*a)[:0] to get the object the pointer is pointing to, and then slice that object, instead of trying to slice the pointer.

The next is just my opinion:

However you don't need the * on the parameter, slices contain a pointer to the underlying array, so a copy of the slice points to the same array. And if you are going to assign another thing to the slice variable I recommend returning the new slice, like this:

package main
import (
    "fmt"
)
func SendData(a []string) []string {
    fmt.Println(a)
    a = a[:0]
    return a
}
func main() {
    var s []string
    s = append(s, "dat","boi")
    s = SendData(s)
    fmt.Println(s)
}