closure_real_world_example.js

function Dog() {
    const name = "Buzo";
    const age = 3;
    const color = "black";
    const sound = "woof";

    function bark() {
        console.log(sound);
    }

    function getAge() {
        console.log(age);
    }

    function getColor() {
        return color;
    }

    return {
        bark: bark,
        getAge: getAge,
        getColor: getColor
    } // this is an object
    // which has bark, getAge, getColor as properties
}
const myDog = Dog(); // myDog is an object, because the call to Dog() 
// returns an object
myDog.bark(); // woof
myDog.getAge(); // 3