slice.go

package main

import "log"

func main() {
	var a [128]byte
	log.Printf("len(a) = %d", len(a))
	log.Printf("cap(a) = %d", cap(a))
	log.Printf("len(a[:10]) = %d", len(a[:10]))
	log.Printf("cap(a[:10]) = %d", cap(a[:10]))
	log.Printf("len(a[10:]) = %d", len(a[10:]))
	log.Printf("cap(a[10:]) = %d", cap(a[10:]))
	s := a[:10]
	x := append(s, []byte("hi")...)
	log.Printf("s = {%v, len=%d, cap=%d}", s, len(s), cap(s))
	log.Printf("x = {%v, len=%d, cap=%d}", x, len(x), cap(x))
}

/*

[nelhage@anarchique:/tmp]$ ./slice
2013/09/23 22:55:02 len(a) = 128
2013/09/23 22:55:02 cap(a) = 128
2013/09/23 22:55:02 len(a[:10]) = 10
2013/09/23 22:55:02 cap(a[:10]) = 128
2013/09/23 22:55:02 len(a[10:]) = 118
2013/09/23 22:55:02 cap(a[10:]) = 118
2013/09/23 22:55:02 s = {[0 0 0 0 0 0 0 0 0 0], len=10, cap=128}
2013/09/23 22:55:02 x = {[0 0 0 0 0 0 0 0 0 0 104 105], len=12, cap=128}

*/