Javascript Object

Javascript object

Created By: chatGPT

JavaScript objects are collections of key-value pairs. They are used to store various data and more complex entities. Each key is a string (or Symbol), and the value can be any valid JavaScript data type, such as strings, numbers, arrays, or even other objects. Here’s an example of creating and manipulating a JavaScript object:

const person = {
    name: 'John Doe',
    age: 30,
    isEmployed: true,
    hobbies: ['reading', 'traveling', 'coding'],
    greet: function() {
        console.log(`Hello, my name is ${this.name}.`);
    }
};

// Accessing object properties
console.log(person.name); // John Doe
console.log(person.age); // 30

// Calling an object method
person.greet(); // Hello, my name is John Doe.

You can also add or update properties dynamically. For example, if you want to add a new property email, you can do it like this:

person.email = 'john.doe@example.com';
console.log(person.email); // john.doe@example.com

To remove a property from an object, you can use the delete operator. For instance, if you want to remove the age property:

delete person.age;
console.log(person.age); // undefined

Objects can also be nested. This means that you can have an object as a value for another object. Below is an example of a nested object:

const student = {
    name: 'Alice',
    age: 25,
    courses: {
        math: 'A',
        science: 'B+',
        literature: 'A-'
    }
};

// Accessing nested object properties
console.log(student.courses.math); // A

In addition, you can use Object methods to manipulate objects. Some of these methods include Object.keys(), Object.values(), and Object.entries() which help you retrieve keys, values, and key-value pairs. Here’s an example using these methods:

const keys = Object.keys(person);
const values = Object.values(person);
const entries = Object.entries(person);

console.log(keys);   // Array of keys
console.log(values); // Array of values
console.log(entries); // Array of [key, value] pairs