GoLang - How to check if key exists in map?

package main

import "fmt"

var m map[string]string

func main() {
    m = make(map[string]string)
    m["foo"] = "abc"

    if val, ok := m["foo"]; ok {
        fmt.Println("foo found -", val)
    } else {
        fmt.Println("foo not found")
    }

    if val, ok := m["bar"]; ok {
        fmt.Println("bar found  -", val)
    } else {
        fmt.Println("bar not found")
    }
}

Output:

foo found - abc
bar not found