haskell function composition

Haskell Function Composition

In Haskell, function composition is a powerful technique that allows you to combine multiple functions into a single function. The composition operator in Haskell is denoted by a dot (.).

The composition operator allows you to apply one function to the result of another function. Here's the general syntax:

(f . g) x = f (g x)

In the above example, f and g are functions, and x is the input value. The composition (f . g) applies g to x first, and then applies f to the result.

Function composition is useful for creating complex functions by combining simpler functions. It allows you to write code in a more concise and expressive way.

Here's an example to illustrate function composition in Haskell:

addOne :: Int -> Int
addOne x = x + 1

double :: Int -> Int
double x = x * 2

addOneAndDouble :: Int -> Int
addOneAndDouble = double . addOne

In the above example, the addOneAndDouble function is defined as the composition of the double function and the addOne function. It first applies addOne to the input, and then applies double to the result.

You can use function composition to chain together multiple functions and create more complex transformations. It is a powerful technique in functional programming and can help make your code more modular and reusable.

Note: The above explanation is based on general knowledge of Haskell and does not cite specific sources.