Auto currying function

auto_curry.js

function multiply() {
  // implementation code goes here
}

multiply(3)(4)(5)  // ==> 60

function multiply(x) {
  return (multiply.y = (multiply.y || 1) * x),multiply.toString = function(){return multiply.y},multiply
}
multiply(3)(4)(5) 

function autoCurry(fn) {
    var args = []

    return function curry() {
        args = args.concat(Array.prototype.slice.call(arguments))
        if (args.length === fn.length)
            return fn.apply(null, args)
        else 
            return curry
    }
}

var multiply = autoCurry(function(a, b, c) {
    return a * b * c
}