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…
A React CLI usually refers to the tool used to quickly bootstrap and manage React projects. The most common ones are: Create React App (CRA) → traditional way, but less used now. Vite → modern, fast, and lightweight (widely used now). Next.js CLI → for full-stack React apps. 🚀 Setting up a React Project…
In Angular, form validation ensures that user input meets defined requirements before being processed. Angular provides two main approaches for building and validating forms: 🔹 1. Types of Forms in Angular Template-driven forms Simpler, suitable for small forms. Validation is declared directly in the template using directives. Uses FormsModule. Reactive forms More scalable and…
Reactive forms are model-driven: you define the form structure and validation logic in your TypeScript code, then bind it to the template. They are more powerful and scalable than template-driven forms. 1️⃣ Import ReactiveFormsModule In app.module.ts: import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { ReactiveFormsModule } from '@angular/forms';…