go make方法

package main

import "fmt"

func main()  {

    // make函数
    makeSlice() // 创建切片
    makeMap() // 创建集合
    makeChan() // 创建channel
}

func makeSlice(){
    sl := make([]string,3)
    sl[0] = "a";
    sl[1] = "b";
    sl[2] = "c";
    fmt.Println(sl)

}

func makeMap(){
    mp  := make(map[int] string)

    mp[0] = "hello"
    mp[1] = "world"
    mp[33] = "!"
    fmt.Println(mp)
}

func makeChan()  {
    mchan := make(chan string)

    go func() {
        mchan <- "hello world"
    }()

    message := <- mchan

    fmt.Println(message)
}