golang5 map

 package main

import "fmt"

func main() {

var mp map[string]int = map[string]int{

"apple":  5,

"pear":   6,

"orange": 9,

}

fmt.Println(mp)

mp1 := make(map[string]string)

fmt.Println(mp1)

mp1["dog"] = "pet"

mp1["cat"] = "pet"

fmt.Println(mp1)

delete(mp1, "cat")

fmt.Println(mp1)

val, exist := mp1["dog"]

fmt.Println(val, exist)

fmt.Println(len(mp1))

}

//cmd

C:\Users\bob\golang1>go run tutorial.go

map[apple:5 orange:9 pear:6]

map[]

map[cat:pet dog:pet]

map[dog:pet]

pet true

1

reference:

https://www.youtube.com/watch?v=yJE2RC37BF4&list=PLzMcBGfZo4-mtY_SE3HuzQJzuj4VlUG0q&index=15