roundround/index.js

A dead simple round-robin array iterator

'use strict';

module.exports = function (array, index) {
  index = index || 0;

  if (array === undefined || array === null)
    array = [];
  else if (!Array.isArray(array))
    throw new Error('Expecting argument to RoundRound to be an Array');

  return function () {
    if (index >= array.length) index = 0;
    return array[index++];
  };
};