Objects in JavaScript | Nested Objects in JavaScript | JavaScript Course for Beginners

In this video, I have discussed about ojects in javascript
#object #javascript #parnikatutorials
JavaScript object is a non-primitive data-type that allows you to store multiple collections of data.
Note: If you are familiar with other programming languages, JavaScript objects are a bit different. You do not need to create classes in order to create objects.

Here is an example of a JavaScript object.

// object
var student = {
Name: 'jagadeesh',
age: 35
};

Here, student is an object that stores values such as strings and numbers.

avaScript Object Declaration

The syntax to declare an object is:

var object_name = {
key1: value1,
key2: value2
}

Here, an object object_name is defined. Each member of an object is a key: value pair separated by commas and enclosed in curly braces {}.

For example,

// object creation
var person = {
name: 'Jagadeesh',
age: 20
};
console.log(typeof person); // object

Accessing Object Properties

You can access the value of a property by using its key.
1. Using dot Notation

Here's the syntax of the dot notation.

objectName.key

For example,

var person = {
name: 'John',
age: 20,
};

// accessing property
console.log(person.name); // John

Using bracket Notation

Here is the syntax of the bracket notation.

objectName["propertyName"]

For example,

var person = {
name: 'John',
age: 20,
};

// accessing property
console.log(person["name"]); // John

JavaScript Nested Objects

An object can also contain another object. For example,

// nested object
var student = {
name: 'John',
age: 20,
marks: {
science: 70,
math: 75
}
}

// accessing property of student object
console.log(student.marks); // {science: 70, math: 75}

// accessing property of marks object
console.log(student.marks.science); // 70

JavaScript Object Methods

In JavaScript, an object can also contain a function. For example,

var person = {
name: 'Sam',
age: 30,
// using function as a value
greet: function() { console.log('hello') }
}

person.greet(); // hello

Run Code

Here, a function is used as a value for the greet key. That's why we need to use person.greet() instead of person.greet to call the function inside the object.

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