codinginvent
codinginvent

August 2, 2024

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August 2, 2024

MERN Installation

To start working with the MERN stack, you’ll need to install and set up each component of the stack: MongoDB, Express.js, React, and Node.js.

1. Install Node.js and npm

Node.js is required to run JavaScript on the server side, and npm (Node Package Manager) is used to manage packages.

  • Download Node.js: Go to the Node.js website and download the LTS version.
  • Install Node.js: Follow the installation instructions for your operating system. This will also install npm.
command

2. Install MongoDB

MongoDB is a NoSQL database that stores data in JSON-like documents.

  • Download MongoDB: Go to the MongoDB website and download the installer for your operating system.

Step-2

Step-3

After installation the message of completed will be shown.

5. Install Express.js

Express.js is a minimal and flexible Node.js web application framework.

Set Up a New React Project

You can use the create-react-app tool to set up a new React project. This tool sets up a modern web development environment with a single command.

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August 2, 2024

MERN Introduction

The MERN stack is a popular technology stack used for building full-stack web applications. The acronym “MERN” stands for MongoDB, Express.js, React, and Node.js.

1. MongoDB

  • Type: NoSQL Database
  • Description: MongoDB is a document-oriented database that uses JSON-like documents with optional schemas. It’s designed for handling large amounts of data and offers flexibility with its schema-less structure.
  • Key Features:
    • Scalability
    • High performance
    • Rich querying capabilities
    • Built-in replication and sharding

2. Express.js

  • Type: Web Application Framework
  • Description: Express.js is a lightweight web application framework for Node.js. It simplifies the process of building server-side applications and APIs by providing a robust set of features for web and mobile applications.
  • Key Features:
    • Middleware support
    • Routing
    • Easy integration with various databases
    • Simplifies server setup and configuration

3. React

  • Type: Front-End Library
  • Description: React is a JavaScript library developed by Facebook for building user interfaces, particularly single-page applications where you need a fast, interactive user experience. React allows developers to create reusable UI components.
  • Key Features:
    • Component-based architecture
    • Virtual DOM for optimized rendering
    • Declarative syntax
    • Rich ecosystem (including tools like React Router and Redux)

4. Node.js

  • Type: JavaScript Runtime
  • Description: Node.js is a server-side JavaScript runtime built on Chrome’s V8 JavaScript engine. It allows developers to use JavaScript for server-side scripting and build scalable network applications.
  • Key Features:
    • Non-blocking, event-driven architecture
    • Package management with npm (Node Package Manager)
    • Asynchronous programming
    • High performance for I/O-bound tasks

Why Learn MERN (Full Stack)?

Industry Demand: MERN stack is widely adopted by startups, tech companies, and enterprises globally. There is a consistent demand for developers proficient in MERN stack due to its efficiency, scalability, and the ability to use JavaScript across the entire application stack.

Popular Frameworks and Tools: React is one of the most popular frontend frameworks for building interactive user interfaces, known for its component-based architecture and virtual DOM. Node.js and Express.js provide a robust backend framework that is lightweight, scalable, and suitable for handling concurrent requests. MongoDB offers flexibility with its NoSQL document-based database approach.

Scalability and Performance: When implemented correctly, MERN stack applications can be highly scalable and performant. Node.js’s non-blocking I/O model and React’s virtual DOM contribute to responsive and efficient applications, while MongoDB’s scalability supports growing data needs.

Career Opportunities: Learning MERN stack can open up various career opportunities as a frontend developer, backend developer, full stack developer, or even specialized roles in JavaScript development. The skills are in demand not only in India but globally, offering opportunities for remote work and international placements.

MERN JOBS IN INDIA 2024

  • Full Stack Developer
  • Node Js Developer
  • MERN stack developer
  • JavaScript developer.
  • Frontend Developer (using React)
  •  Backend Developer (using Node.js and Express.js),

Freelancing  Jobs  on  MERN

Freelancing with MERN stack skills can be a lucrative and flexible career choice. Here’s a guide on how to find and succeed in freelancing jobs with expertise in MongoDB, Express.js, React, and Node.js:

1. Finding Freelance Opportunities

Freelance Platforms

  • Upwork: Search for jobs related to full-stack development or specific MERN stack tasks. Create a detailed profile showcasing your MERN expertise.
  • Freelancer: Browse projects that require MERN stack skills. Bid on projects that match your expertise.
  • Fiverr: Offer specific services related to the MERN stack, such as building custom applications, integrating APIs, or setting up MongoDB databases.
  • Toptal: Apply to become a Toptal freelancer, where you can find high-quality clients looking for skilled developers.

MERN USED BY COMPANIES

Facebook uses React extensively for its frontend development, though they have their own backend infrastructure.

Instagram, owned by Facebook, also uses React for its frontend.

Python Class VS Object

Q:-  What is Class?

In Java, a class is a blueprint or a prototype from which objects are created. A class encapsulates data for the object and methods to manipulate that data. It defines the properties (attributes) and behaviors (methods) that the objects created from the class can have.

Q:-  What is Object?

In Java, an object is an instance of a class. When a class is defined, no memory is allocated until an object of that class is created. Objects are the fundamental units of object-oriented programming and represent real-world entities. An object consists of:

  • State: Represented by attributes or fields (variables).
  • Behavior: Represented by methods (functions).
  • Identity: A unique identifier, usually the memory address where the object is stored.
  • Classes are defined using the class keyword. A class typically includes a constructor, methods, and can extend other classes. 
  • Classes are template for creating the object.

Animal classes

Basic Parts of a Class

  1. Class Definition: This is like creating the blueprint.
  2. Constructor: This is a special function that sets up new objects based on the blueprint.
  3. Methods: These are functions that describe what the objects can do.

Using the Class

When you have a class, you can use the class to create objects:

class Car {

  constructor(name, year) {

    this.name = name;

    this.year = year;

  }

}

const myCar1 = new Car("Ford", 2014);

const myCar2 = new Car("Audi", 2019);

Creating an Object

Using the blueprint, we can create a car:

const myCar = new Car('Toyota', 'Corolla');

myCar.describe();                                                                   

 Output: This car is a Toyota Corolla.

Object

A javaScript object is an entity having state and behavior (properties and method). For example: car, pen, bike, chair, glass, keyboard, monitor etc.

JavaScript is an object-based language. Everything is an object in JavaScript.

JavaScript is template based not class based. Here, we don’t create class to get the object. But, we direct create objects.

How to create Object

const object_name = {
   key_1: value_1,
   key_2: value_2,

MERN Introduction

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