React / Angular / Vue Course in Pune
Modern Frontend Development — From JavaScript to Deployment

React, Angular, and Vue are all built on JavaScript. Students who try to learn frameworks without a solid JavaScript foundation end up confused, struggling, and copying code they do not understand. This module eliminates that problem — building genuine JavaScript fluency before touching any framework.

ES6+ features covered in depth: let and const and why var should be avoided (hoisting, function scope vs block scope, temporal dead zone), arrow functions and how this binding differs from regular functions, template literals for string interpolation, destructuring assignment for objects and arrays (with default values and renaming), the spread operator and rest parameters, default function parameters, optional chaining (?.) and nullish coalescing (??). Modules: the import/export system that modern JavaScript applications use — named exports, default exports, dynamic imports, and barrel files. Promises: the problem they solve (callback hell), creating and chaining promises, Promise.all, Promise.allSettled, Promise.race. Async/await: making asynchronous code read synchronously, error handling with try/catch, common async pitfalls. Array methods: map, filter, reduce, find, findIndex, some, every, flat, flatMap — the functional array operations that appear constantly in React and Vue code. Object methods: Object.keys, Object.values, Object.entries, Object.assign, and the spread operator for object merging. Closures, the event loop, the call stack, and the microtask queue — understanding JavaScript's runtime model prevents an entire class of confusing bugs.

TypeScript is no longer optional for professional frontend development. Angular is built entirely in TypeScript. React and Vue codebases at most companies use TypeScript. Job postings increasingly require TypeScript skills. This module covers TypeScript comprehensively — not just the syntax but the reasoning behind the type system.

TypeScript setup with tsconfig.json — the compilation options that matter for React (jsx setting), Angular (strict mode), and Vue projects. Basic types: string, number, boolean, array, tuple, enum, any, unknown, never, void, null, and undefined — and the crucial difference between any (unsafe, turns off type checking) and unknown (safe, requires type narrowing before use). Interfaces vs type aliases: both define object shapes, but interfaces are open (can be extended) while type aliases are closed. When to use each is a common interview question. Union types (string | number) and intersection types (TypeA & TypeB). Generics: generic functions and generic interfaces — how they enable TypeScript's powerful type inference in libraries like React's useState and Angular's HttpClient. TypeScript with React: typing component props with interfaces, typing useState, useRef, and useReducer, typing event handlers (React.ChangeEvent, React.MouseEvent), and typing custom hooks. TypeScript utility types: Partial, Required, Readonly, Pick, Omit, Record, Extract, Exclude — understanding these reduces boilerplate and makes types more composable. Type narrowing: typeof, instanceof, and user-defined type guards for working safely with union types.

React's core mental model — components as functions of state — is elegant and powerful once understood properly. This module builds that understanding from first principles, covering why React re-renders, how to think in components, and how the fundamental hooks work under the hood.

JSX: what it compiles to (React.createElement calls), why JSX is not HTML (className, htmlFor, style as objects), and self-closing tags. Functional components: why class components are legacy and functional components with hooks are the modern standard. Props: passing data from parent to children, PropTypes vs TypeScript for prop validation, children prop, and default props. State with useState: what state is (data that when changed causes a re-render), updating state correctly (never mutate state directly), state batching in React 18, and the functional update form for state that depends on previous state. Event handling: synthetic events in React, the difference between onClick={handleClick} and onClick={() => handleClick()}, and why the second form re-creates the function on every render. The useEffect hook: running side effects after render, the dependency array (the most misunderstood part of React hooks), cleanup functions for subscriptions and timers, and the rules of hooks (only call hooks at the top level, only call in React functions). useRef: referencing DOM elements, persisting values across renders without causing re-renders. useContext: prop drilling problem and the Context API solution, when context is appropriate and when it causes performance problems. Conditional rendering: using && for short-circuit rendering, ternary operators, and separate component rendering for complex cases.

Once the React fundamentals are solid, the path to professional-level React development involves mastering state management at scale, routing, custom hook patterns, and performance optimisation techniques that prevent common slowdowns in large applications.

React Router v6: route definitions with createBrowserRouter, nested routes, dynamic route parameters with useParams, programmatic navigation with useNavigate, the Link and NavLink components, and protected routes that redirect unauthenticated users. Redux Toolkit: the modern, recommended way to use Redux. createSlice for defining state, reducers, and actions together, configureStore for creating the store, useSelector for reading state in components, useDispatch for dispatching actions, and createAsyncThunk for handling async operations (API calls) in Redux. RTK Query: the powerful data fetching and caching layer built into Redux Toolkit — defining API services, automatic caching, background re-fetching, and pessimistic vs optimistic updates. Advanced hooks: useReducer for complex state logic, useMemo for memoising expensive calculations, useCallback for memoising event handler references, and custom hooks for extracting reusable stateful logic. React performance: React.memo for component memoisation, why memoisation is not always the answer, the React DevTools profiler for identifying performance bottlenecks, code splitting with React.lazy and Suspense, and the concurrent features in React 18 (useTransition, useDeferredValue). Form handling with React Hook Form: controlled vs uncontrolled components, validation, and integration with TypeScript.

Angular is a complete, opinionated framework that makes decisions React deliberately avoids. Understanding Angular means understanding a comprehensive ecosystem — TypeScript-first, dependency injection, reactive programming with RxJS, and a strongly structured module system. This makes Angular ideal for large teams where consistency matters more than flexibility.

Angular architecture: Modules (NgModule), Components, Services, Directives, and Pipes — and how they fit together. The Angular CLI: creating projects, generating components and services, running the development server, and building for production. Components in depth: the @Component decorator, template syntax (interpolation, property binding, event binding, two-way binding with ngModel), component lifecycle hooks (ngOnInit, ngOnChanges, ngOnDestroy, ngAfterViewInit), and @Input and @Output for parent-child communication. Directives: structural directives (*ngIf, *ngFor, *ngSwitch) and attribute directives, and creating custom directives. Services and Dependency Injection: creating services with @Injectable, injecting services through constructor parameters, and Angular's hierarchical injector. The HttpClient module for REST API calls: making GET/POST/PUT/DELETE requests, interceptors for adding authentication headers globally, and error handling. RxJS: Observables vs Promises (the fundamental difference), the Observable, Observer, and Subscription concepts, key operators (map, filter, switchMap, mergeMap, catchError, debounceTime, distinctUntilChanged), and subjects (BehaviorSubject for state management without NgRx). Angular Routing: the RouterModule, route guards (CanActivate, CanDeactivate), lazy loading feature modules. Angular Reactive Forms: FormBuilder, FormGroup, FormControl, Validators, and custom validators — preferred over template-driven forms for complex form logic.

Vue 3 with the Composition API represents a significant evolution from Vue 2 — and understanding the Composition API properly reveals how Vue's reactivity system works, making you a much more effective Vue developer than those who only learn the Options API from tutorials.

Vue project setup with create-vue (Vite-powered): understanding the project structure, Single File Components (SFCs) with the .vue extension, and the template-script-style structure. The Composition API: the setup() function (and the more concise script setup syntax), ref() and reactive() for declaring reactive state — and the critical difference between them (ref() wraps primitives in a Ref object with .value access, reactive() makes objects reactive directly). Computed properties with computed() and watchers with watch() and watchEffect() — and when to use each. Component communication: props with defineProps, emits with defineEmits, provide/inject for deep component trees, and the differences from React's equivalent patterns. Vue Router: route definitions, the useRouter and useRoute composables, dynamic routes, navigation guards (beforeEach), and lazy loading routes for performance. Pinia state management: the modern replacement for Vuex, defining stores with defineStore, state properties, getters, and actions, and using stores in components with the useStore pattern. Vue's built-in directives: v-if/v-else/v-show, v-for with keys, v-model for two-way binding, v-bind and v-on shorthand, v-once and v-memo for performance. Transitions and animations with Vue's Transition component. The module project is a complete Vue 3 blog platform with user authentication, post creation, and real API integration.

Most React jobs at serious companies involve Next.js rather than plain Create React App. Next.js solves real production problems — SEO (client-rendered React apps are difficult for search engines to index), initial page load performance (server-rendered HTML arrives ready to display), and developer experience (file-based routing, built-in API routes, image optimisation). Learning Next.js is what separates React hobbyists from React professionals.

Next.js App Router (Next.js 13+ architecture): understanding the app directory, layouts, pages, loading states, and error boundaries — and how this differs from the older pages directory. Server Components vs Client Components: the fundamental shift in Next.js 13 — server components render on the server (better performance, direct database access, no client JavaScript bundle cost), client components render on the client (interactive, can use hooks). Data fetching: fetch with caching options (force-cache, no-store, revalidate), Server Actions for form submissions without explicit API routes, and React Suspense for streaming. Static Site Generation with generateStaticParams for dynamic routes. API Routes: creating serverless API endpoints within a Next.js application. Next.js Image component for automatic image optimisation. Next.js Font optimisation. Environment variables management in Next.js. Deployment on Vercel: connecting a GitHub repository, automatic deployments on push, environment variables in Vercel, preview deployments for pull requests. The module project is a full Next.js application — a job listing platform with server-rendered listings, a search API route, and static company profile pages.

Knowing how to build features is one skill. Knowing how to build features that work reliably, load fast, and are usable by everyone — including users with disabilities — is what makes a senior frontend developer. This module covers the professional practices that separate intermediate developers from those who get promoted.

Testing React applications with Jest and React Testing Library (RTL): the RTL philosophy (test the way users use the application, not implementation details), rendering components, querying elements by role/label/text, simulating user interactions with userEvent, testing async behaviour with waitFor, and mocking API calls. Component testing with Vitest (the faster Vite-native alternative to Jest used in Vue and Next.js projects). Web accessibility (a11y): the WCAG 2.1 guidelines, semantic HTML (using button instead of div with onClick), ARIA attributes (aria-label, aria-describedby, aria-expanded), keyboard navigation, focus management, colour contrast requirements, and using the axe-core automated accessibility checker. Core Web Vitals: Largest Contentful Paint (LCP), First Input Delay (FID/INP), and Cumulative Layout Shift (CLS) — the Google ranking signals that every frontend developer should understand. Techniques to improve each: image optimisation, font loading strategies, lazy loading below-the-fold content, avoiding layout shifts. Bundle optimisation: tree shaking, code splitting, dynamic imports, and analysing bundle size with the Webpack Bundle Analyser.

The final module produces a deployed, portfolio-ready application and prepares students for the specific technical interview formats used at Pune's frontend hiring companies — from startup technical assignments to enterprise interview panels.

Capstone project: students build a complete frontend application of their choice. Popular choices include a real-time dashboard consuming a public API (weather, crypto, sports), an e-commerce frontend with cart and checkout flow, a social platform with posts, likes, and comments, a kanban board with drag-and-drop, or a portfolio website with a CMS backend. React is the recommended choice for capstone projects given market demand, but Angular or Vue are accepted. The project must include TypeScript, a state management solution, protected routes, REST API integration, responsive design, and deployment on Vercel or Netlify. GitHub portfolio: pinning projects, writing README files with screenshots and live demo links, the contribution graph, and how technical interviewers evaluate GitHub profiles. Frontend interview preparation: common React interview questions (virtual DOM, reconciliation, re-render triggers, useEffect dependency array, useMemo vs useCallback), JavaScript interview questions (closure, this binding, event bubbling, prototype chain, ES6 features), TypeScript questions, CSS layout questions (flexbox, grid, positioning), and take-home assignment strategy. Mock technical interviews with the trainer. Resume building for frontend roles with ATS-friendly keyword placement.