package main

import "fmt"

func main() {
	var a [7]int = [7]int{4, 5, 6, 6, 4, 7, 7}
	var slice []int = a[2:4]
	fmt.Println(len(slice))
	slice2 := append(slice, 55, 55)
	fmt.Println(slice2)
	fmt.Println(len(slice2))
	//默认分配10个空间
	var ip map[int]string
	//key不能重复,前面会替换后面那个 value 可以重复
	ip = make(map[int]string, 10)
	ip[103883] = "张三"
	ip[173718] = "李四"

	ip[173718] = "李"
	fmt.Println(ip)
	//查找
	value, flag := ip[103883]
	fmt.Println(value)
	fmt.Println(flag)
	fmt.Println(len(ip))
}