Introduction to javascript Classes
what is a JavaScript Object?
javascript objects, divide code into logical sections and group together similar data. Primitive values and reference values are terms used in JavaScript. Primitive values include Number, Boolean, Null, Undefined, Strings, and Symbol; reference values include things like DOM nodes, Arrays
What is an object?
An object in JavaScript is a grouping of linked information and features. Key-value pairs are used to store this data, with each key—also referred to as a property name having a distinct value assigned to it. object values might be functions, other objects, strings, or even integers. In essence, a JavaScript object is much like any other real-world object, such as a person, a home, or an automobile, each with unique traits and actions.
Example :-
let car =
{
name :"safari",
color : "royale blue",
price:" 15 lakh to 25 lakh",
year:"2024",
model:"xz+",
start:function() {
console.log("car started");
}
};
This example car object five properties - name, color, price, year, model key-value paire keys strings("name","model","year","color","price") value are "safari", "xz+" and 2024 , respectively. five property, start
Why Use Objects?
Objects are very helpful because they allow us to combine
related functions and data into one clear unit. This approach helps reduce
complexity in our code and makes it easier to understand and organize,
especially in larger systems.
For example, if you are developing a website that needs to
manage user data, you can store each user's details—like name, email address,
and age—in an object. This way, you can easily access and change the user's
data without handling many different variables.
example :-
let user = {
name : "geeta",
email : "geeta@gmail.com",
age : 40,
user greet:function()
{
console.log('hi');
}
};
user object store the user name, email,age with user greet method prints.
creating and using objects
create a object using object literal. object properties 'title','author','year'. & method details
Example :
let book ={
title : ' data structure';
author: ' lipschute' ;
Price: 500 ;
};
C++ robort lafore 600
Modifying Objects :-
modify existing ones or even delete properties.
Example :-
book.title =' C++'; //modify existing property
book.subject = 'program';//add new property
delete book.proce; / /remove property
Syntax :-
let objectName = {
key1:value1,
key2:value2,
//more key-value pairs
};
Example :-
let book ={
title : ' data structure';
author: 'Narasimha
Karumanchi ' ;
Price: 500 ;
};
Explanation :-
book is the object name.
title,author, and price properties of object.
data structire, Narasimha
Karumanchi, and 500 values
JavaScript Object
Characteristics
1. JavaScript objects are a basic part of the language. They
provide a strong way to store and manipulate data. Understanding the features
of JavaScript objects is essential for becoming skilled in JavaScript. In the
next sections, we will look at the main characteristics that define JavaScript
objects.
2 . Key-Value Pairs At the heart of every JavaScript object
is the idea of key-value pairs. An object can be seen as a collection of these
pairs, where each key, also known as a property, is connected to a specific
value.
• Keys: The names of
the properties, which can be shown as strings or symbols.
• Values: The data
linked to the keys, which can be any type, including strings, numbers, arrays,
functions, or even other objects.
Example:
let book = {
name: "data structure",
Price: 500 ;
isbook: true
};
Benefits of Using Objects in JavaScript
. JavaScript objects are essential features of the language.
They provide developers with important tools. Whether you are creating basic
scripts or complex web applications, using objects can significantly enhance
your coding performance. Here are some of the key benefits of using objects in
JavaScript.
1.Organization of data
The main advantage of objects is their ability to organize
data in a clear and logical way. By grouping related data, objects improve the
readability and maintainability of your code.
2. Reusability
Objects enhance code reuse, especially when combined with
functions or classes. By creating objects with data and services, you can
easily reuse and extend them in your application.
3. Sequence and prototype chain
JavaScript objects use prototype properties, allowing them
to inherit properties and methods from other objects. This feature helps create
hierarchical systems and shared functionality between components.
4. Dynamic change
JavaScript objects are robust. You can add, modify, or
remove objects and methods in real time. These changes make it easier to meet
your evolving product needs without overhauling your codebase.
5. Support for JSON
JavaScript objects work well with JSON, which is a common
format for data exchange. This consistency makes it easy to sequence and
deserialize data, particularly when interacting with APIs or collecting data.
6. Easy ways to adapt
JavaScript provides many built-in methods for manipulating
objects, making them simpler to work with. These methods include Object.keys(),
Object.values(), Object.entries(), and Object.assign()..
Conclusions about JavaScript objects
1. A JavaScript object acts as an ordered collection of interrelated data and functions, organized as key-value pairs. These features play an important role in creating sophisticated data structures and applications in JavaScript. Having a solid understanding of how to create, navigate, and manipulate objects will greatly enhance your skills as a JavaScript developer. Whether it’s processing basic data or building complex web applications, customizability is an important milestone in your journey developing with JavaScript.
FAQs :-
1. What is a JavaScript object?
A JavaScript object is a collection of key-value pairs, where each key is a unique identifier (property) that maps to a specific value. Objects can store data types such as strings, numbers, settings, functions, or even other objects.
2. How do you create an object in JavaScript?
There are many ways to do things in JavaScript:
• Object Literal Syntax : Typical method.
JavaScript scripting
Copy the code
ma cart = {
is: "Toyota", .
Example: "Corolla", .
The year is
};
3. How do you get the properties of an object?
You can access the object using dot notation or bracket notation.
• Reference points:
JavaScript scripting
Copy the code
console.log(person.name);
• Letters in parentheses:
JavaScript scripting
Copy the code
console.log(person["mfe"]);
Dot characters are more common, but parentheses are useful when a property name is dynamic or contains special characters.
5. What is a method used in a JavaScript object?
A method is a function stored as a property of an object. Methods enable objects to work with their data.
For example:
JavaScript scripting
Copy the code
for account = { 1 .
add: function (a,b)
{ .
return a + b;
}
};
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