Javascript composition

compose.js

function sequence() {
  const funcs = arguments;
  return function(x) {
    return Array.from(funcs).reduce((x, func) => func.call(null, x), x);
  };
}

function compose() {
  return sequence.apply(null, Array.from(arguments).reverse());
}

const doIt = compose(
  str => str+"!",
  str => str.toUpperCase(),
  str => str+"world",
);
console.log(doIt("hello"));