es6 curry

es6curry.js

// es6 riff on https://medium.com/@kevincennis/currying-in-javascript-c66080543528
function curry(fn) {
  const arity = fn.length
  
  return (function resolver(...memory) {
    return function(...args) {
      const local = memory.concat(args)
      const next = local.length >= arity ? fn : resolver
      return next(...local)
    };
  }());
}