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﻿'use strict';

module.exports = function flip() {
  var _this = this;

  var collection = {};

  if (Array.isArray(this.items)) {
    Object.keys(this.items).forEach(function (key) {
      collection[_this.items[key]] = Number(key);
    });
  } else {
    Object.keys(this.items).forEach(function (key) {
      collection[_this.items[key]] = key;
    });
  }

  return new this.constructor(collection);
};