The Compose Function

compose.js

const compose = (...funcs) => {
  if (funcs.length === 0) {
    return (arg) => arg
  }
  
  if (funcs.length === 1) {
    return funcs[0]
  }
  
  const last = funcs[funcs.length - 1]
  const rest = funcs.slice(0, -1)
  return (...args) => rest.reduceRight((composed, f) => f(composed), last(...args))
}