AutoCurry snippet

autocurry.js

/**
 * To Array
 */
function toArray(args) {
  return [].slice.call(args);
}

/**
 * Curry function
 */
function curry(fn){
  var args = Array.prototype.slice.call(arguments, 1);
  function f(){
    return fn.apply(this, args.concat(toArray(arguments)));
  }
  return f;
}


/**
 * Auto Curry function
 */
function autoCurry(fn, numArgs) {
  numArgs = numArgs || fn.length;
  function f() {
    if (arguments.length < numArgs)
    {
      return numArgs - arguments.length > 0 ?
      autoCurry(curry.apply(this, [fn].concat(toArray(arguments))),
      numArgs - arguments.length) :
      curry.apply(this, [fn].concat(toArray(arguments)));
    }
    else
    {
      return fn.apply(this, arguments);
    }
  }
  f.toString = function() { return fn.toString(); };
  f.curried = true;
  return f;
}