Returns a function that composes a series of methods together, passing the return value of each from left to right (First method can take multiple arguments)

compose.js

const compose = (...functions) => (...start) => (
  functions.reduce((result, f) => (
    (typeof result === 'object') ? f(...result) : f(result)
  ), start)
)



/**
 * Usage
 */
const add = (a, b = 4) => a + b
const sub1 = (a) => a - 1
const mul2 = (a) => a * 2
const div2 = (a) => a / 2
const addSub1Mul2Div2 = compose(add, sub1, mul2, div2)
console.log(addSub1Mul2Div2(1, 3))
// -> 3

// why? 'cause div2(mul2(sub1(add(1, 3)))) looks gross