Online Haskell Compiler Features
Pure Functions & Lazy Evaluation
- Experience true functional programming where every function is pure and side-effect free using this haskell online editor
- Test lazy evaluation with infinite lists—compute only what you need, when you need it
- Understand why Haskell is the gold standard for teaching functional programming concepts
- Practice referential transparency: replace any function call with its result without changing program behavior
Advanced Type System Mastery
- Learn Hindley-Milner type inference that deduces types without annotations in this haskell compiler
- Master type classes for ad-hoc polymorphism—Functor, Applicative, Monad hierarchies
- Define algebraic data types for precise domain modeling with sum and product types
- Catch bugs at compile-time with one of the most powerful type systems in programming
Monadic Programming & Effects
- Understand how Haskell manages I/O, state, and effects through monadic composition
- Practice do-notation for sequencing monadic operations in readable syntax
- Test Maybe and Either monads for elegant error handling without exceptions
- Perfect for computer science students learning category theory and abstract algebra
GHC Compilation Without Setup
- Full GHC compilation to native binary—experience real Haskell development in your browser
- Share functional programming solutions to academic exercises or algorithm implementations
- Ideal for learning Haskell before tackling production frameworks like Yesod or Servant
- No GHCup, Cabal, or Stack installation needed—just pure functional programming instantly
Haskell Keyboard Shortcuts
Experience the power of Replit AI
This entire Haskell compiler was built by Replit Agent 3 from a natural language prompt. Replit's environment facilitates rapid development, iteration and testing code for users of any technical ability. Develop software faster and better with Replit’s autonomous AI.
Get started freeFrequently Asked Questions
What Haskell compiler version is used?
This online haskell compiler uses GHC (Glasgow Haskell Compiler) with full support for standard Haskell 2010 features plus common GHC extensions. You get authentic Haskell compilation and execution—the same toolchain used in production Haskell development.
Can I use Haskell libraries like Parsec or Aeson?
External libraries aren't available in this haskell playground, but the Prelude and standard library functions are fully supported. Focus on core Haskell concepts: pure functions, algebraic data types, type classes, and monadic programming. Perfect for learning functional programming fundamentals.
Is this good for learning functional programming?
Absolutely! Haskell is the premier language for teaching pure functional programming. This haskell online editor lets you practice lazy evaluation, higher-order functions, type inference, and monads without local installation. Ideal for CS students and developers exploring functional paradigms.
How does lazy evaluation work in Haskell?
In this haskell compiler, expressions are evaluated only when needed. You can define infinite lists like [1..] and Haskell computes only the elements you actually use. Test this unique feature to understand how laziness enables elegant solutions to complex problems.
Can I save Haskell code for later?
Yes! Click Share to generate a permanent URL containing your Haskell code. Perfect for sharing functional programming solutions with classmates, posting to forums, or keeping a portfolio of Haskell exercises. Your code stays accessible indefinitely.
What's the difference between GHC and GHCi?
This haskell code runner uses GHC for full compilation to native executables. While GHCi is an interpreter for REPL sessions, our compiler gives you the complete compile-then-execute workflow. You'll see both compilation errors and runtime output, just like local Haskell development.
Build, test, and ship faster than ever with Replit
Replit is the only platform that combines a cloud IDE, Agentic Al coding, and seamless team collaboration to help you prototype and ship apps in record time. Build in 50+ languages, work from any device, and deploy in one click — no setup required.
