package main

import (
	"fmt"
)

func main() {
	m := map[string]string{
		"name":    "ccmouse",
		"course":  "CCMouse",
		"sites":   "imooc",
		"quality": "CCMouse",
	}

	m2 := make(map[string]int) // m2 == empty map

	var m3 map[string]int // m3 == nil

	fmt.Println(m, m2, m3)

	fmt.Println("traversing map")
	for k, v := range m {
		fmt.Println(k, v)
	}

	fmt.Println("getting values")
	courseName := m["course"]
	fmt.Println(courseName)
	if courseName, ok := m["cours"]; ok {
		fmt.Println(courseName)
	} else {
		fmt.Println("key does not exit")
	}

	fmt.Println("deleting values")

	name, ok := m["name"]
	fmt.Println(name, ok)

	delete(m, "name")

	name, ok = m["name"]
	fmt.Println(name, ok)
}