HomeCoursesUsing fp-ts for Functional Programming in TypeScript

Intermediate

30h

Updated 1 month ago

Using fp-ts for Functional Programming in TypeScript
Save

Gain insights into functional programming with TypeScript. Learn about core fp-ts functionality and monads like Option and Either to enhance your TypeScript projects effectively.

Join 2.7 million developers at

Overview

Content

Reviews

Functional programming is a programming paradigm that emphasizes immutability and pure functions. It not only makes code easier to understand, test, and parallelize, but also offers improved performance. TypeScript is a statically-typed object-oriented programming language that builds on JavaScript. Although TypeScript is not a purely functional programming language, it can be used to write functional code too. This course is for beginners with little to no knowledge of TypeScript and functional programming. You’ll start with learning their basics and then move on to develop several projects of increasing complexity. You’ll also learn about fp-ts, a library that provides several functional programming constructs. The course covers the core functionality of fp-ts and important monads such as Option, Either, and TaskEither. By the end of the course, you’ll know how to apply functional programming techniques and fp-ts to new and existing TypeScript projects, and be on your way to becoming an expert in both!

Functional programming is a programming paradigm that emphasizes immutability and pure functions. It not only makes code easier ...Show More

WHAT YOU'LL LEARN

Familiarity with the concepts of functional programming

Working knowledge of functional JavaScript

An understanding of TypeScript’s type system

The ability to build your own projects using TypeScript

Hands-on experience with the fp-ts library

Familiarity with the concepts of functional programming

Content

111 Lessons10 Quizzes

Introduction to Functional Programming

8 Lessons

Get familiar with functional programming's concepts, benefits in JavaScript, and TypeScript enhancements.

Before We Dive Deeper

Why Functional Programming?

Why JavaScript?

Why TypeScript?

Functional Programming with TypeScript

Coding Challenge: Rewriting Function with Better Types

Solution Review: Rewriting Function with Better Types

Quiz on Types

Tidbits: Some Useful JavaScript and TypeScript

11 Lessons

Unpack the core of essential JavaScript/TypeScript fundamentals for functional programming and practical coding challenges.

Setting Up TypeScript

Creating Functions in JavaScript

Backticks for Easy Printing

The Ternary Operator

Discriminating Unions

Summary: JavaScript and TypeScript Tidbits

Coding Challenge: Create Algebraic Data Type

Solution Review: Create Algebraic Data Type

Coding Challenge: Rewriting Code as an Expression

Solution Review: Rewriting Code as an Expression

Quiz: Tidbits of JavaScript and TypeScript

First Steps with Functional Programming

15 Lessons

Examine fundamental aspects of functional programming and practical applications using higher-order functions, currying, composition, and monads.

Introduction to Functional Programming

Writing Functional Code

Writing Functional Programs

Currying

Combining Currying and Composition

Problems with Currying and Composition

Monads

Advantages of Monads

Briefly about Types

Summary: First Steps with Functional Programming

Coding Challenge: Higher-Order Function

Solution Review: Higher-Order Function

Coding Challenge: Using Option in Function

Solution Review: Using Option in Function

Quiz: First Steps with Functional Programming

Our First Project: User Registration

12 Lessons

Grasp the fundamentals of user registration with fp-ts, focusing on robust type definitions, validations, and adaptable code structure.

Defining Our Types

Validation with Either

Before We Continue: Either or Validation?

Creating our User with Lifting

Bringing it Together

Cope with Changing Business Requirements

Summary: User Registration Project

Coding Challenge: Adding a Check

Solution Review: Adding a Check

Coding Challenge: Working with Either and Pipe

Solution Review: Working with Either and Pipe

Quiz: User Registration Project

Deploying a Monitoring Application

15 Lessons

Take a closer look at deploying and monitoring applications using functional programming in TypeScript.

AWS Lambda and SAM

Setting Up Our Project

Using the Cloudwatch SDK

Monads for Asynchronous Behavior

Transforming Our Data

Synchronous Behavior and IO

Bringing it All Together

Extensions

A Small Aside: Memoization

Summary: Deploying a Monitoring Application

Coding Challenge: Working with Flow

Solution Review: Working with Flow

Coding Challenge: Working with TaskEither

Solution Review: Working with TaskEither

Quiz: Deploying a Monitoring Application

Testing

8 Lessons

Tackle different testing methodologies, TDD, and functional programming testing practices in TypeScript.

The Types of Testing

Test-Driven Development

FP and Testing

Property-based Testing

Summary: Testing

Coding Challenge: Writing a Parameterized Test

Solution Review: Writing a Parameterized Test

Quiz: Testing

Automate Login-Workflow Testing with Playwright

Project

Once More unto the Breach: Our Final Application

11 Lessons

Master the steps to build and deploy hotel reservations using TypeScript, Lambdas, and DynamoDB.

Setting Up the Environment of Our Final Application

Writing Our First Create Lambda Code

Core Logic of the Create Lambda

Bringing it Together

Creating the Retrieve Lambda

DynamoDB

Adding the Real Database

Summary: Final Application

Coding Challenge: Using Sequence in Function

Solution Review: Using Sequence in Function

Quiz: Testing

Expanding our Reservation Application

10 Lessons

Get familiar with enhancing the reservation app using Reader, State monads, and improved configs.

Using the Reader Monad to Gather Config

Using State

Better Error Types

Restaurants and sequenceS

Choosing Configs

Exploring Some More Ideas

Summary: Expanding our Reservation Application

Coding Challenge: Using Reader Monad in Function

Solution Review: Using Reader Monad in Function

Quiz Yourself about Reservation Application

Rewriting an Application

11 Lessons

Walk through rewriting an application using functional programming principles for better maintainability.

The Original Application

Evaluations

Improvements Overview

Our New Code Setup

Validation

Dealing with the Asynchronous Calls

Advantages of Our Functional Approach

Summary: Rewriting an Application

Coding Challenge: Writing Function Using Switch

Solution Review: Writing Function Using Switch

Quiz Yourself on the Application

10.

Advanced FP Techniques

8 Lessons

Master the steps to advanced FP techniques, including DSLs, tagless final, and free monads.

Domain-Specific Language

Tagless Final

Free Monads

Executable and Declarative Encoding and Algebraic Design

Summary: Advanced FP Techniques

Coding Challenge: Create a Mini DSL

Solution Review: Create a Mini DSL

Quiz Yourself on Advanced FP Techniques

11.

Conclusion

1 Lessons

Enhance your skills in applying TypeScript and fp-ts for functional programming, and future explorations.

Closing Thoughts

12.

Appendix

1 Lessons

Solve problems in functional programming with advanced monads like Writer and These.

Additional Concepts

Certificate of Completion

Showcase your accomplishment by sharing your certificate of completion.

Course Author:

Sam Van Overmeire

Developed by MAANG Engineers

Every Educative resource is designed by our in-house team of ex-MAANG software engineers and PhD computer science educators — subject matter experts who’ve shipped production code at scale and taught the theory behind it. The goal is to get you hands-on with the skills you need to stay ahead in today's constantly evolving tech landscape. No videos, no fluff — just interactive, project-based learning with personalized feedback that adapts to your goals and experience.

Trusted by 2.7 million developers working at companies

"These are high-quality courses. Trust me. I own around 10 and the price is worth it for the content quality. EducativeInc came at the right time in my career. I'm understanding topics better than with any book or online video tutorial I've done. Truly made for developers. Thanks"

Anthony Walker

@_webarchitect_

"Just finished my first full #ML course: Machine learning for Software Engineers from Educative, Inc. ... Highly recommend!"

Evan Dunbar

ML Engineer

"You guys are the gold standard of crash-courses... Narrow enough that it doesn't need years of study or a full blown book to get the gist, but broad enough that an afternoon of Googling doesn't cut it."

Software Developer

Carlos Matias La Borde

"I spend my days and nights on Educative. It is indispensable. It is such a unique and reader-friendly site"

Souvik Kundu

Front-end Developer

"Your courses are simply awesome, the depth they go into and the breadth of coverage is so good that I don't have to refer to 10 different websites looking for interview topics and content."

Vinay Krishnaiah

Software Developer

Hands-on Learning Powered by AI

See how Educative uses AI to make your learning more immersive than ever before.

Instant Code Feedback

Evaluate and debug your code with the click of a button. Get real-time feedback on test cases, including time and space complexity of your solutions.

AI Mock Interviews

Test your skills in a simulated interview setting. Receive personalized feedback based on your performance. Available for Coding Interviews, System Design, and more.

Adaptive Learning

At various checkpoints throughout Educative courses, you will be prompted to take a quick assessment. Receive a condensed curriculum tailored to your strengths and skill gaps.

Explain with AI

Select any text within any Educative course, and get an instant explanation — without ever leaving your browser.

AI Code Mentor

AI Code Mentor helps you quickly identify errors in your code, learn from your mistakes, and nudge you in the right direction — just like a 1:1 tutor!

Free Resources

FOR TEAMS

Interested in this course for your business or team?

Unlock this course (and 1,000+ more) for your entire org with DevPath

Using fp-ts for Functional Programming in TypeScript Save

Using fp-ts for Functional Programming in TypeScript
Save