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  • #149919

    I’m going through some lessons at

    function add(firstName, lastName, email, phoneNumber) {
        contacts[contacts.length] = {
            this.firstName: firstName,
            this.lastName: lastName,
            this.phoneNumber: phoneNumber

    For this code.. why exactly is “this” not required?

    versus for a constructor..

    function Human(name, age) { = name;
    this.age = age;

    When you use a constructor function, you invoke it with the ‘new’ operator:

    function Person (firstName, lastName) { 
    this.firstName = firstName; 
    this.lastName = lastName; 
    var johnSmith = new Person('John', 'Smith'); 

    Which puts the ‘johnSmith’ object in the context of ‘this’ in the constructor function.

    The ‘add’ function takes several parameters, adds a new object to the contacts array and sets the properties of the object using object literal notation which does not require ‘this’ when setting properties.

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