Go slice behavior

slice_sample.go

package main

import "fmt"

func main() {
	hoge := make([]int, 10, 10)
	show(hoge)

	for i := range hoge {
		hoge[i] = i
	}

	hoge = hoge[:5]
	show(hoge)
	hoge = hoge[0:cap(hoge)]
	show(hoge)
	hoge = append(hoge[:5], hoge[6:]...)
	show(hoge)
	hoge = append(hoge, 10)
	show(hoge)
	hoge = append(hoge, 11)  // reallocate and copy
	show(hoge)
	
	hoge = append(hoge[:0], hoge[3:]...)
	show(hoge)
}

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

https://play.golang.org/p/_1DL1NIsmG