---
id: kb-2026-00310
title: Haskell Language
schema_type: TechArticle
category: computer-science
language: en
confidence: medium
last_verified: "2026-05-28"
created_date: "2026-05-22"
generation_method: human_only
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: af-computer-science-haskell-language-1
    statement: >-
      The Haskell 2010 Language Report specifies Haskell as a general-purpose, non-strict, purely
      functional programming language.
    source_title: Haskell 2010 Language Report
    source_url: https://www.haskell.org/onlinereport/haskell2010/
    confidence: medium
  - id: af-computer-science-haskell-language-2
    statement: >-
      The Glasgow Haskell Compiler is the main compiler implementation used by the Haskell
      ecosystem.
    source_title: The Glasgow Haskell Compiler
    source_url: https://www.haskell.org/ghc/
    confidence: medium
  - id: af-computer-science-haskell-language-3
    statement: >-
      Cabal provides tooling and a package-description format for building and distributing Haskell
      software.
    source_title: Cabal User Guide
    source_url: https://www.haskell.org/cabal/users-guide/
    confidence: medium
completeness: 0.88
known_gaps:
  - >-
    This field is under active research and rapid development; some conclusions may evolve with new
    evidence or technological advances
  - >-
    Certain sub-topics are covered at a general level; specialized edge cases and nuanced
    applications may not be fully addressed
disputed_statements: []
primary_sources:
  - id: ps-haskell-language-1
    title: Haskell 2010 Language Report
    type: standard
    year: 2010
    institution: Haskell.org
    url: https://www.haskell.org/onlinereport/haskell2010/
  - id: ps-haskell-language-2
    title: The Glasgow Haskell Compiler
    type: official_documentation
    year: 2026
    institution: Haskell.org
    url: https://www.haskell.org/ghc/
  - id: ps-haskell-language-3
    title: Cabal User Guide
    type: official_documentation
    year: 2026
    institution: Haskell.org
    url: https://www.haskell.org/cabal/users-guide/
secondary_sources: []
updated: "2026-05-28"
---




## 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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