hash-table-array-sizer-mvp.js

var LimitedArray = function(limit) {
  var storage = [];

  var limitedArray = {};
  limitedArray.get = function(index) {
    checkLimit(index);
    return storage[index];
  };
  limitedArray.set = function(index, value) {
    checkLimit(index);
    storage[index] = value;
  };
  limitedArray.each = function(callback) {
    for (var i = 0; i < storage.length; i++) {
      callback(storage[i], i, storage);
    }
  };

  var checkLimit = function(index) {
    if (typeof index !== 'number') {
      throw new Error('setter requires a numeric index for its first argument');
    }
    if (limit <= index) {
      throw new Error('Error trying to access an over-the-limit index');
    }
  };

  return limitedArray;
};