Catalog / Haskell Cheatsheet
Haskell Cheatsheet
A concise reference for Haskell syntax, data types, functions, and common operations. This cheat sheet provides a quick guide to help you write and understand Haskell code efficiently.
Basic Syntax and Types
Syntax Fundamentals
Function Definition |
Example:
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Comments |
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Layout |
Haskell uses indentation to define blocks. Consistent indentation is crucial. |
Let Bindings |
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Where Bindings |
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Case Expressions |
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Basic Data Types
Int |
Integer values with a fixed range. |
Integer |
Integer values with arbitrary precision. |
Float/Double |
Floating-point numbers. |
Bool |
Boolean values: |
Char |
Single Unicode characters. |
String |
List of characters. |
Type Signatures
Explicit type signatures are recommended for clarity.
Example:
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Functions and Control Flow
Function Application
Basic Application |
Functions are applied by simply placing arguments after the function name.
Example:
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Parentheses |
Parentheses are used to control precedence.
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Composition |
Function composition using
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Control Flow
If-Then-Else |
Example:
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Guards |
Guards provide an alternative to if-then-else for defining functions.
Example:
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Case Expressions |
Pattern matching with
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Lambda Expressions
Anonymous functions defined using
Example:
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Data Structures
Lists
List Syntax |
Example:
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Cons Operator |
The
Example:
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List Comprehension |
Example:
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Common Functions |
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Tuples
Tuple Syntax |
Example:
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Accessing Elements |
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Data Type Declarations
Example:
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Typeclasses and Monads
Typeclasses
Defining a Typeclass |
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Instances |
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Common Typeclasses |
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Monads
Monad Typeclass |
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Do Notation |
Syntactic sugar for working with Monads.
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Common Monads |
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IO Monad
Used for performing input/output operations.
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