go内建方法 new和make区别

package main

import (
   "fmt"
   "reflect"
)

func main()  {

   // make函数
   //makeSlice() // 创建切片
   //makeMap() // 创建集合
   //makeChan() // 创建channel
   NewMap() // make创建的是指针类型 new的是引用类型
}

func NewMap()  {
   mp := new(map[int] string)
   mp1 := make(map[int] string)
   fmt.Println(reflect.TypeOf(mp))
   fmt.Println(reflect.TypeOf(mp1))
}


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)
}