Be a part of our community of 1M+ users who develop and demonstrate their skills on CodeSignal
4 courses
62 practices
5 hours
A four-course Haskell path for programmers new to functional style: start with expressions, types, and pure functions, then learn data structures, recursion, higher-order list processing, custom types, safe error handling, and interactive `IO` by building a command-line task manager.
Haskell Foundations: Expressions, Types, and Functions
7 lessons
16 practices
First steps in Haskell for programmers new to functional style. Learn expressions, types, pure functions, GHCi errors, local helpers, and branching while writing small runnable programs.
Learn how Haskell structures data and replaces loops. Use pattern matching, lists, strings, tuples, safe access with `Maybe`, list comprehensions, and recursion, including accumulator-style recursion.
Build a small interactive command-line task manager. Define domain types, use `Maybe` and `Either` for absence and failure, separate pure logic from `IO`, and handle validated user input.
Hear what our customers have to say about CodeSignal Learn
I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!
Francisco Aguilar Meléndez
Data Scientist
+11
I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.
Faith Yim
Software Engineer
+14
It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.
Alex Bush
Full Stack Engineer
+9
I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.
Abbey Helterbran
Tech consultant
+8
I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.
Jonathan Miller
Senior Machine Learning Engineer
+12
I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!
