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...
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