Golang remove first differences between slice value and pointer

playground.go

package main

import "fmt"

func main() {
	s := []int{2, 3, 5, 7, 11, 13}
	printSlice(s)

	removeFirst(s)
	printSlice(s)
	
	removeFirstAddress(&s)
	printSlice(s)
}

func printSlice(s []int) {
	fmt.Printf("len=%d cap=%d %v\n", len(s), cap(s), s)
}

func removeFirst(s []int) {
	s = append(s[:0], s[1:]...)
}

func removeFirstAddress(s *[]int) {
	*s = append((*s)[:0], (*s)[1:]...)
}


// output:
// len=6 cap=6 [2 3 5 7 11 13]
// len=6 cap=6 [3 5 7 11 13 13]
// len=5 cap=6 [5 7 11 13 13]