# 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.