go语言基础之map的增删改查

package main

import "fmt"

func main() {
	var m = map[string]int{"a": 1, "b": 2, "c": 3}

	v1 := m["a"]
	fmt.Printf("a:%d\n", v1)

	m["a"] = 5
	v2 := m["a"]
	fmt.Printf("a:%d\n", v2)
	v3 := len(m)

	fmt.Printf("the length of map is :%d\n", v3)

	for k, v := range m {
		fmt.Printf("%s =>:%d\n", k, v)
	}

	delete(m, "c")
	for k, v := range m {
		fmt.Printf("%s =>:%d\n", k, v)
	}
	
	m["c"] = 6
	for k, v := range m {
		fmt.Printf("%s =>:%d\n", k, v)
	}
}