In JavaScript, we often work with Arrays (lists of items) and Objects (key-value pairs). JavaScript gives us built-in methods to manipulate data in arrays in a cleaner and more powerful way. 🔹 Arrays in JavaScript An array is a list of values stored in a variable. let numbers = [1, 2, 3, 4, 5];…
What is Vite? Vite is a fast tool for building websites. It helps you see your changes instantly while coding, instead of waiting for the whole site to reload. Think of it as a super-fast “web server + builder” for modern web apps. Example Imagine you want to make a small React app: Create…
Webpack is a module bundler for JavaScript applications. It takes modules with dependencies and generates static assets representing those modules. In simple terms, it bundles your JavaScript files (and optionally other assets like CSS, images, etc.) into a single file (or a few files) that browsers can understand. Webpack is especially useful for modern…
Conditional rendering in React is a way to render different UI elements or components based on certain conditions, usually determined by state or props. Essentially, it lets your component “decide” what to display dynamically. React uses JavaScript logic inside JSX, so you can use if statements, ternary operators, or logical && for conditional rendering.…
1. Forms in React A form in React is a way to gather input from the user, like text fields, checkboxes, radio buttons, etc. In React, handling forms is a little different than plain HTML because React controls the state of the input elements. 2. Controlled Component A controlled component is an input element…
1. Lists in React A list is typically an array of items that you want to display in the UI. In React, you often use the .map() method to render these arrays into components or JSX elements. Example: import React from "react"; function FruitList() { const fruits = ["Apple", "Banana", "Cherry"]; return ( <ul>…
Event handling in React is how you capture and respond to user interactions such as clicks, typing, mouse movements, form submissions, and more. React handles events in a synthetic event system, which wraps the browser's native events to provide consistent behavior across different browsers. Here’s a clear breakdown: Key Points About Event Handling in…
1. What is State? In React, state is a way to store data that can change over time and affect what’s rendered on the screen. Think of it as a “memory” for your component. When state changes, React automatically re-renders the component with the new value. 2. What is useState? useState is a React…
In React, props (short for properties) are a way to pass data from a parent component to a child component. They make components reusable and dynamic. Here’s a breakdown with an example: 🔹 Basic Example of Props // Child Component function Greeting(props) { return <h1>Hello, {props.name}!</h1>; } // Parent Component export default function App()…
JSX stands for JavaScript XML.It’s a syntax extension for JavaScript that looks like HTML but is used in React to describe what the UI should look like. JSX makes it easier to write and understand the structure of React components. Key Points about JSX: Looks like HTML but isn’t HTML – It gets compiled…