Slice external and internal

main.go

package main

import "fmt"
//Pass slice through the function
//function have own slise wich have common part with external slice
//but! if inner slice change own size, external slise isn't changed
func main() {
	arr := make([]byte, 16)
	fmt.Println("hello01", len(arr), arr) //hello01 16 [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
	cutArrSize(arr)
	fmt.Println("hello02", len(arr), arr) //hello02 16 [1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0]
}
func cutArrSize(arr []byte) {
	for len(arr) > 0+8 {
		arr[0] = 1 // remembered in external array
		arr = arr[1:]
		fmt.Println("hello05", len(arr))
	}
	fmt.Println("hello10", len(arr), arr) //hello10 8 [0 0 0 0 0 0 0 0]

	for i := 0; i < 32; i++ {
		if len(arr) == i {
			arr = append(arr, 0) // not pass in external array
		}
		// arr[i] = 1
		fmt.Println("hello15", len(arr))
	}
	fmt.Println("hello20", len(arr), arr) //hello20 32 [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
}