Declare maps in Golang

declare_maps.go

package main

import (
	"fmt"
)

func main() {
	var mscores = make(map[string]int)
	mscores["Chetan"] = 90
	// Returns mscrores: map[Chetan:90]
	fmt.Println("mscrores:", mscores)

	var score map[string]int
	// Runtime error: panic: assignment to entry in nil map
	score["Chetan"] = 90
	
	var students = make(map[string]int)
	students["Chetan"] = 90
	students["John"] = 75
	students["Alice"] = 30

	// Returns mscrores: map[John:75 Alice:30 Chetan:90]
	fmt.Println("students scrores:", students)
	
	values := map[string]int{
		"abc": 123,
		"def": 345,
		"ghi": 567,
		"jkl": 897,
	}
	// Returns values: map[abc:123 def:345 ghi:567 jkl:897]
	fmt.Println("values:", values)
	
}