interview-arithmetic/go_slice/main.go

/**
测试golang slice扩展长度的规则

结论, slice cap空间够的时候，cap不变，cap不够的时候，会乘2.
*/
package main

import "fmt"

func main() {
	var ary = make([]int, 1, 1)

	ary[0] = 1
	fmt.Printf("value: %v, len: %v, cap: %v\n", ary, len(ary), cap(ary))

	ary = append(ary, 2)
	fmt.Printf("value: %v, len: %v, cap: %v\n", ary, len(ary), cap(ary))

	ary = append(ary, 3)
	fmt.Printf("value: %v, len: %v, cap: %v\n", ary, len(ary), cap(ary))

	ary = append(ary, 4)
	fmt.Printf("value: %v, len: %v, cap: %v\n", ary, len(ary), cap(ary))

	ary = append(ary, 5)
	fmt.Printf("value: %v, len: %v, cap: %v\n", ary, len(ary), cap(ary))
}