[Go] Deleting a key-value pair in map.

package main

import (
    "log"
)

func main() {
    m := make(map[string]string)

    m["Go"] = "Beego"
    m["Python"] = "Django"
    m["Ruby"] = "Rails"
    m["PHP"] = "Laravel"

    _, ok := m["PHP"]
    if !ok {
        log.Fatal("It should exist")
    }

    // Remove the key/value pair.
    delete(m, "PHP")

    _, ok = m["PHP"]
    if !(ok == false) {
        log.Fatal("It should not exist")
    }
}