Ellipses

index.js

var __slice = Array.prototype.slice;

function variadic (fn) {
  var fnLength = fn.length;

  if (fnLength < 1) {
    return fn;
  }
  else if (fnLength === 1)  {
    return function () {
      return fn.call(
        this, __slice.call(arguments, 0))
    }
  }
  else {
    return function () {
      var numberOfArgs = arguments.length,
          namedArgs = __slice.call(
            arguments, 0, fnLength - 1),
          numberOfMissingNamedArgs = Math.max(
            fnLength - numberOfArgs - 1, 0),
          argPadding = new Array(numberOfMissingNamedArgs),
          variadicArgs = __slice.call(
            arguments, fn.length - 1);

      return fn.apply(
        this, namedArgs
              .concat(argPadding)
              .concat([variadicArgs]));
    }
  }
};
function unary(first) {
  return first;
}

unary('coo', 'lee', 'oh')

variadic(unary)('why', 'hello', 'you')

function bianary(first, rest) {
  return [first, rest];
}

bianary('why', 'hello', 'you')
variadic(bianary)('why', 'hello', 'you')