Given is the following code:  function two() {     return "success"; }  function one() {     two();     return "fail"; }   If you test the code by calling function one(), you will always get "fail".  The question is, how can I...

I am on Day 3 of learning JavaScript. I cames across this code:  class B {     constructor(name) {         this.name = name;     }      printn() {         return this.name;     } }  class A extends B {     constructor(name, age) {         super(name)...

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I'm learning react from the docs, but not sure what the super() does in this example. Usually, doesn't it take the arguments that are passed to making a new instance and then calls React.Component's constructor method to incorporate these...

Consider the following code:  class Base {    constructor() {       let _myPrivateData = 'Base';       this.print = () => { console.log(_myPrivateData); };    } };  class Derived extends Base {    constructor() {        super();       this...

I want to test a method 'foo' that calls its super method 'foo':  foo(){      super.foo();      //do some extra stuff }   If it would reference another method from the same class, e.g.  foo(){      this.baa();      //do some extra stu...

The MDN page about set seems to state that an      [ECMAScript 2015] setter must not appear in an object literal ... with a   data entry for the same property.   However when using the super keyword this no longer seems to apply.  class Foo {     con...

As there are no private method support yet in Javascript, I usually simply declare a normal function outside of class body and provide this as argument:  class Foo {     constructor() {         _doPrivateStuff(this);     } }  function _doPrivateStuff...

I get this class inheritance structure:  class GrandParent{   funcA(){     console.log('GrandParent');   } } class Parent extends GrandParent{   funcA(){     console.log('Parent');   } } class Child extends Parent{   funcA(){     cons...

What does this refer to in the following code:  class Foo extends React.Component {   constructor() {     super();     this.state = {       bar: "baz",     }   } }   I read YDKJS and, it says that this does not refer to the function itself, b...