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# AI solution for JavaScript Coding Question on BFE.dev

11. what is Composition? create a pipe()

Here's one possible implementation of `pipe()`

:

`const pipe = (fns) => (x) => fns.reduce((acc, fn) => fn(acc), x);`

Explanation:

`pipe`

takes an array of functions`fns`

as its argument, and returns a new function that applies each function in`fns`

to the output of the previous function.- The new function takes one argument
`x`

, which is passed as the input to the first function in`fns`

. `reduce`

is used to invoke each function in`fns`

in turn. The accumulator`acc`

starts out as`x`

, and is replaced by the return value of each function as it is invoked.- Finally, the output of the last function is returned as the output of the new function.

Example usage:

`const times = (y) => (x) => x * y;const plus = (y) => (x) => x + y;const subtract = (y) => (x) => x - y;const divide = (y) => (x) => x / y;const twice = pipe([times(2)]); // equivalent to (x) => x * 2const increment = pipe([plus(1)]); // equivalent to (x) => x + 1const multiplyAndAdd = pipe([times(2), plus(3)]); // equivalent to (x) => x * 2 + 3const subtractAndDivide = pipe([subtract(3), divide(4)]); // equivalent to (x) => (x - 3) / 4console.log(twice(3)); // output: 6console.log(increment(3)); // output: 4console.log(multiplyAndAdd(3)); // output: 9console.log(subtractAndDivide(3)); // output: 0`