Haskell is a purely functional programming language that is based on lambda calculus. It was first developed in the late 1980s and has since gained popularity among developers for its strong type system, immutability, and lazy evaluation. Haskell is known for its elegant and concise code, which allows developers to write complex programs in a clear and understandable manner.
Haskell has a distinctive syntax that sets it apart from other programming languages. It uses indentation to indicate block structure, similar to Python. Haskell is a statically typed language, which means that all variables have a type that is known at compile time. Functions in Haskell are also first-class citizens, meaning they can be passed as arguments to other functions and returned as values.
Here is an example of a simple function in Haskell that calculates the factorial of a number:
factorial :: Integer -> Integer
factorial 0 = 1
factorial n = n * factorial (n - 1)
The Haskell ecosystem provides a range of tools for developers to write, test, and deploy Haskell code. Some popular tools include:
Overall, Haskell offers a unique set of features and tools that make it a powerful language for writing high-quality, functional programs.