A small utility function to compose functions, lazily evaluated

compose.js

function compose(func, ...funcs) {
  return function(...args) {
      return funcs.length > 0
        ? compose(...funcs)(func(...args))
        : func(...args)
  }
}

// Or, in a more compact version:
const compose = (func, ...funcs) => (...args) =>
  funcs.length > 0 ? compose(...funcs)(func(...args)) : func(...args);