The document is a comprehensive guide for preparing for frontend developer interviews, covering essential topics such as HTML, CSS, JavaScript, TypeScript, and ReactJS, along with advanced concepts like state management and performance optimization. It includes practical examples for each topic, as well as sections on testing, version control, CI/CD pipelines, and API integration. Additionally, the document offers advice on soft skills, behavioral questions, system design, and portfolio building to ensure a well-rounded preparation.

1. Frontend Developer Interview
Prep Course
Comprehensive Preparation for
Frontend Developer Interviews
Author: Manjunath Kalburgi

2. HTML & CSS Fundamentals
• Semantic HTML
• Example: <article>, <section>, <nav> tags
• CSS Flexbox and Grid
• Example: Creating a responsive layout with
flexbox
• Responsive Web Design
• Example: Using media queries to adjust layout
• CSS Preprocessors (SASS, LESS)
• Example: Nesting and variables in SASS

3. JavaScript Essentials
• ES6+ Features (let, const, arrow functions,
etc.)
• Example: Using const for constants and let for
variables
• DOM Manipulation
• Example: Adding an element to the DOM
using document.createElement()
• Event Handling
• Example: Adding a click event listener to a
button

4. Advanced JavaScript
• Closures and Scope
• Example: Creating a closure to maintain state
• Prototypes and Inheritance
• Example: Using prototypes to create objects
with shared methods
• The `this` keyword
• Example: Using `this` in different contexts
(global, object, function)
• Callbacks and Promises

5. TypeScript Basics
• Types and Interfaces
• Example: Defining a type for a user object
• Type Inference
• Example: Letting TypeScript infer the type of a
variable
• Generics
• Example: Creating a generic function to handle
different types
• Decorators

6. ReactJS Core Concepts
• Components and Props
• Example: Creating a functional component
with props
• State Management
• Example: Using useState to manage
component state
• Lifecycle Methods
• Example: Using useEffect to handle side
effects

7. State Management Libraries
• Redux Fundamentals
• Example: Creating a Redux store and
dispatching actions
• Redux Toolkit
• Example: Using createSlice to simplify Redux
code
• MobX
• Example: Using observable and action to
manage state

8. Component Design Patterns
• Higher-Order Components (HOCs)
• Example: Creating an HOC to add logging to a
component
• Render Props
• Example: Using a render prop to pass a
function as a child
• Compound Components
• Example: Creating a component with sub-
components for flexibility

9. Styling in React
• CSS-in-JS (Styled-Components, Emotion)
• Example: Creating a styled button component
• CSS Modules
• Example: Using CSS modules to scope styles
locally
• Theming
• Example: Creating a theme and applying it
with ThemeProvider
• Responsive Design

10. Building and Optimizing React
Applications
• Code Splitting
• Example: Using React.lazy and Suspense for
code splitting
• Lazy Loading
• Example: Lazy loading images to improve
performance
• Memoization Techniques (React.memo,
useMemo, useCallback)
• Example: Using useMemo to memoize
expensive calculations

11. Testing Frontend Applications
• Unit Testing with Jest
• Example: Writing a test for a React component
• Component Testing with React Testing Library
• Example: Testing a component's rendered
output
• End-to-End Testing with Cypress
• Example: Writing an end-to-end test for a
login flow
• Mocking API calls

12. Version Control with Git
• Git Basics (clone, commit, push, pull)
• Example: Cloning a repository and making a
commit
• Branching and Merging
• Example: Creating a new branch and merging
it into main
• Pull Requests and Code Reviews
• Example: Creating a pull request and
requesting a review

13. Build Tools and Module Bundlers
• Webpack Configuration
• Example: Setting up a basic Webpack config
• Babel Transpiling
• Example: Using Babel to transpile ES6 to ES5
• Task Runners (Gulp, Grunt)
• Example: Automating tasks with Gulp
• Linters and Formatters (ESLint, Prettier)
• Example: Configuring ESLint and Prettier for a
project

14. CI/CD Pipelines
• Introduction to CI/CD
• Example: Benefits of continuous integration
and deployment
• Setting up CI with GitHub Actions, Travis CI,
CircleCI
• Example: Creating a CI workflow with GitHub
Actions
• Automated Testing and Deployment
• Example: Running tests and deploying
automatically

15. API Integration
• Fetch API
• Example: Fetching data from an API
• Axios
• Example: Making a GET request with Axios
• Handling Authentication and Authorization
• Example: Using JWT for authentication
• Working with RESTful APIs
• Example: CRUD operations with a RESTful API
• GraphQL Basics

16. Soft Skills and Interview
Preparation
• Behavioral Questions
• Example: Preparing answers for common
behavioral questions
• System Design Fundamentals
• Example: Designing a scalable web application
• Mock Interviews
• Example: Practicing with mock interviews
• Portfolio Building
• Example: Creating a portfolio website