slice.go

package main

import "fmt"

func test() {
	a := [...]int{1, 2, 3, 4, 5}
	x := a[2:4]
	fmt.Println(len(x), cap(x), x)
	y := x[0:1]
	fmt.Println(len(y), cap(y), y)
}

func test2() {
	var a []int
	var oldCap = 0
	for i := 0; i < 2048; i++ {
		a = append(a, i)
		if cap(a) != oldCap {
			fmt.Println(len(a), cap(a))
			oldCap = cap(a)
		}
	}
}

func test3() {
	a := make([]int, 1, 4)
	b := append(a, 1)
	fmt.Println(a, b)
}

func main() {
	test3()
	// var s []int
	// fmt.Println(len(s), cap(s))
	// a := [...]int{0, 1, 2, 3}
	// fmt.Printf("%T %d %d\n", a, len(a), cap(a))
	// x := a[:1]
	// fmt.Printf("%T %d %d\n", x, len(x), cap(x))
	// y := a[2:]
	// fmt.Printf("%T %d %d\n", y, len(y), cap(y))
	// x = append(x, y...)
	// fmt.Printf("%v %d %d\n", a, len(a), cap(a))
	// fmt.Printf("%v %d %d\n", x, len(x), cap(x))
	// fmt.Printf("%v %d %d\n", y, len(y), cap(y))
	// x = append(x, y...)
	// fmt.Printf("%v %d %d\n", a, len(a), cap(a))
	// fmt.Printf("%v %d %d\n", x, len(x), cap(x))
	// fmt.Printf("%v %d %d\n", y, len(y), cap(y))
	// fmt.Println(&y[0], &a[2])
}