strange_go_slice.go

strange_go_slice.go

package main

import "fmt"

func main() {
	a := []int{1, 2, 3}

	b := a[0:2]
	fmt.Println(cap(a), cap(b))

	b[0] = 0

	fmt.Println(a, b)

	b = append(b, 4)
	fmt.Println(a, b)
	fmt.Println(cap(a), cap(b))

	b = append(b, 4)

	a[1] = 0
	fmt.Println(a, b)
	fmt.Println(cap(a), cap(b), len(a), len(b))

}

// 3 3
// [0 2 3] [0 2]
// [0 2 4] [0 2 4]
// 3 3
// [0 0 4] [0 2 4 4]
// 3 6 3 4