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What is a Hook? A hook is a special function that starts with "use" (like useState, useEffect) that lets you "hook into" React features. Before Hooks: Want to store data? → Must use class components Function components were "dumb" - couldn't rememb...
What is an HOC? A Higher Order Component is a function that takes a component and returns a new enhanced component. Think of it as a wrapper that adds extra features to your existing components. const withSomething = (Component) => { return (props)...
What are Custom Hooks? Custom hooks are reusable functions that start with 'use' and contain stateful logic. The Basic Rule: Must start with "use" (like useCounter, useAPI, useLocalStorage) Can call other hooks inside them Regular JavaScript funct...
What is Lazy Loading? Lazy loading loads components only when needed, not all at once, improving initial load time. The Problem It Solves: Without lazy loading, your entire app loads at once = SLOW initial page load With lazy loading, With lazy loa...
What is Virtual DOM? Virtual DOM is a JavaScript object representation of the real DOM - a lightweight copy in memory Memory tip: Real DOM = Actual House (expensive to modify) Virtual DOM = Blueprint of house (cheap to modify) Visual Representation: ...