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Note: In all the examples below, the normal anonymous function notation (function(a, b) {...}) may be replaced by the new ES6 arrow notation: (a,b) => {...}.

JavaScript Constructors

Constructors are basically objects that can be created by functions.

For example, even though I said don't use it, the Object() constructor is an example of a default constructor in JavaScript

        /*Not recommended*/
var foo = new Object({a: "b"}); /*<-- How to use any constructor*/

/*Literal notation (recommended)*/
var foo = {a: "b"};

Here is an example of a constructor function:

        function Person(fName, lName) {
  this.firstName = fName;
  this.lastName = lName;
  this.fullName = function() {return this.firstName + " " + this.lastName;};