11. what is Composition? create a pipe()

what is Composition? It is actually not that difficult to understand, see @dan_abramov 's explanation.

Here you are asked to create a pipe() function, which chains multiple functions together to create a new function.

Suppose we have some simple functions like this

const times = (y) =>  (x) => x * yconst plus = (y) => (x) => x + yconst subtract = (y) =>  (x) => x - yconst divide = (y) => (x) => x / y

Your pipe() would be used to generate new functions

pipe([  times(2),  times(3)])  // x * 2 * 3pipe([  times(2),  plus(3),  times(4)]) // (x * 2 + 3) * 4pipe([  times(2),  subtract(3),  divide(4)]) // (x * 2 - 3) / 4

notes

1. to make things simple, functions passed to pipe() will all accept 1 argument