base

Core data structures and operations

Version on this page:	4.20.0.0
LTS Haskell 23.3:	4.19.2.0
Stackage Nightly 2025-01-08:	4.20.0.0
Latest on Hackage:	4.21.0.0

See all snapshots base appears in

BSD-3-Clause licensed

Maintained by Core Libraries Committee

This version can be pinned in stack with:base-4.20.0.0@sha256:6b1ae61e45db82289a287b0bb1fc689c3b418d97bffe8e226df23d60e7967405,9234

Module documentation for 4.20.0.0

Control
Data
- Data.Array
  - Data.Array.Byte
- Data.Bifoldable
- Data.Bifoldable1
- Data.Bifunctor
- Data.Bitraversable
- Data.Bits
- Data.Bool
- Data.Char
- Data.Coerce
- Data.Complex
- Data.Data
- Data.Dynamic
- Data.Either
- Data.Enum
- Data.Eq
- Data.Fixed
- Data.Foldable
- Data.Foldable1
- Data.Function
- Data.Functor
  - Data.Functor.Classes
  - Data.Functor.Compose
  - Data.Functor.Const
  - Data.Functor.Contravariant
  - Data.Functor.Identity
  - Data.Functor.Product
  - Data.Functor.Sum
- Data.IORef
- Data.Int
- Data.Ix
- Data.Kind
- Data.List
  - Data.List.NonEmpty
- Data.Maybe
- Data.Monoid
- Data.Ord
- Data.Proxy
- Data.Ratio
- Data.STRef
  - Data.STRef.Lazy
  - Data.STRef.Strict
- Data.Semigroup
- Data.String
- Data.Traversable
- Data.Tuple
- Data.Type
  - Data.Type.Bool
  - Data.Type.Coercion
  - Data.Type.Equality
  - Data.Type.Ord
- Data.Typeable
- Data.Unique
- Data.Version
- Data.Void
- Data.Word
Debug
- Debug.Trace
Foreign
GHC
Numeric
- Numeric.Natural
Prelude
System
- System.CPUTime
- System.Console
  - System.Console.GetOpt
- System.Environment
  - System.Environment.Blank
- System.Exit
- System.IO
  - System.IO.Error
  - System.IO.Unsafe
- System.Info
- System.Mem
  - System.Mem.StableName
  - System.Mem.Weak
- System.Posix
  - System.Posix.Internals
  - System.Posix.Types
- System.Timeout
Text
- Text.ParserCombinators
  - Text.ParserCombinators.ReadP
  - Text.ParserCombinators.ReadPrec
- Text.Printf
- Text.Read
  - Text.Read.Lex
- Text.Show
  - Text.Show.Functions
Type
- Type.Reflection
  - Type.Reflection.Unsafe
Unsafe
- Unsafe.Coerce

Depends on 2 packages(full list with versions):

ghc-internal, ghc-prim

Used by 2906 packages in nightly-2025-01-06(full list with versions):

Haskell's base library provides, among other things, core types (e.g. Data.Bool and Data.Int), data structures (e.g. Data.List, Data.Tuple and Data.Maybe), the Control.Exception mechanism, and the System.IO & Control.Concurrent operations. The Prelude module, which is imported by default, exposes a curated set of types and functions from other modules.

Other data structures like Map, Set are available in the containers library. To work with textual data, use the text library.