kenbellows

    > true == 1
    -> true
    > false == 0
    -> true

    if (Number(myNum) === 2) {}

  1. create a new empty object; call it `newObj`
  2. call the constructor using `newObj` as its `this` context, so that `this.a = 1` is effectively `newObj.a = 1`
  3. if the constructor has a `prototype` property defined, invoke `newObj.__proto__ = myconstructor.prototype` to establish the prototype chain on the new object

    let vertebrate = {hasSpine: true},
        mammal = {hasHair: true},
        dog = {sound: 'bark'};
        sparky = {name: 'Sparky'},
        jumbo = {name: 'Jumbo'};
    
    mammal.__proto__ = vertebrate;
    dog.__proto__ = mammal;
    sparky.__proto__ = dog;
    jumbo.__proto__ = dog;
    
    console.log(sparky.hasSpine); // true
    console.log(jumbo.hasHair);   // true
    console.log(sparky.sound);    // 'bark'
    console.log(jumbo.name);      // 'Jumbo'