point free style haskell

Point-Free Style Haskell

Point-free style, also known as tacit programming or combinatorial programming, is a programming style in Haskell where functions are defined without explicitly mentioning their arguments. Instead, functions are defined in terms of other functions and combinators. This style can lead to more concise and expressive code.

In point-free style, functions are defined using function composition and higher-order functions. By composing functions together, you can create new functions without explicitly mentioning the arguments. This can make the code more readable and easier to reason about.

Here's an example of a function defined in point-free style:

-- Function to calculate the sum of squares of a list of numbers
sumOfSquares :: [Int] -> Int
sumOfSquares = sum . map (^2)

In this example, the sumOfSquares function is defined by composing the sum function with the map (^2) function. The map (^2) function squares each element of the list, and the sum function calculates the sum of the squared elements.

Note that point-free style is not always appropriate or necessary. It is a matter of personal preference and readability. Some programmers find point-free style more elegant and concise, while others prefer to explicitly mention the arguments.