Haskell Language

Status: public · Confidence: medium (0.865) · Basis: verified_sources

## TL;DR

Haskell (1990, named after Haskell Curry) is a purely functional, lazily evaluated programming language with a powerful static type system. All functions are pure (no side effects by default), and IO is explicitly handled through monads. Used in: finance (Standard Chartered, Barclays), compiler development (GHC).

## Core Explanation

Type system: Hindley-Milner with type classes (like Rust traits). Algebraic data types + pattern matching. Monads (IO, Maybe, Either, State, Reader) structure side effects. `do` notation: imperative-looking syntax for monadic code. Laziness: expressions evaluated only when needed — enables infinite data structures. GHC (Glasgow Haskell Compiler) is the primary implementation.

## Further Reading

- [Haskell Documentation](https://www.haskell.org/documentation/)

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