Objects in JavaScript

An object is a collection of properties (key and value). It’s the basis of almost everything in JavaScript.

Creating and Accessing

const person = {
    name: "Juan",
    age: 30,
    greet: function() {
        console.log("Hello!");
    }
};

// Dot notation (Standard)
console.log(person.name);

// Bracket notation (For dynamic names or with spaces)
console.log(person["age"]);

Manipulation

• Add: person.job = "Dev";
• Delete: delete person.age;
• Verify: "name" in person; // true

The this Concept

The reserved word this refers to the current object in which the code is being executed. Its value changes depending on how the function is called.

const user = {
    name: "Facu",
    introduce() {
        console.log(`Hello, I'm ${this.name}`);
    }
};

user.introduce(); // "Hello, I'm Facu"

Inside an object’s method, this allows us to access the other properties of that same object.