3.4_maps_literall_construction_and_sort.go

package main

import (
	"fmt"
	"sort"
)

type user struct {
	name    string
	surname string
}

func main() {
	//using literal construction for maps
	// declare and initialize the map with values:
	users := map[string]user{
		"Alipio": {"Eisson", "Alipio"},
		"Mickey": {"Mickey", "Mouse"},
		"Peter":  {"Peter", "Parker"},
		"Bruce":  {"Bruce", "Wayne"},
	}
	for key, value := range users {
		fmt.Println(key, value)
	}
	fmt.Println()
	for key := range users {
		fmt.Println(key)
	}
	fmt.Println("====================")
	// pull the keys from the map
	var keys []string
	for key := range users {
		keys = append(keys, key)
	}
	fmt.Println(keys) //[Mickey Peter Bruce Alipio]
	// sorting keys alphabeticall
	sort.Strings(keys)
	fmt.Println(keys) // [Alipio Bruce Mickey Peter]

	for _, key := range keys {
		fmt.Println(key, users[key])
	}

	fmt.Println("====================")
	// delete the key Mickey
	delete(users, "Mickey")
	// find the deleted key
	u, found := users["Mickey"]

	fmt.Println(u, found) // { } false
}