lodash/_SetCache.js

define(['./_MapCache', './_setCacheAdd', './_setCacheHas'], function(MapCache, setCacheAdd, setCacheHas) {

  /**
   *
   * Creates an array cache object to store unique values.
   *
   * @private
   * @constructor
   * @param {Array} [values] The values to cache.
   */
  function SetCache(values) {
    var index = -1,
        length = values ? values.length : 0;

    this.__data__ = new MapCache;
    while (++index < length) {
      this.add(values[index]);
    }
  }

  // Add methods to `SetCache`.
  SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
  SetCache.prototype.has = setCacheHas;

  return SetCache;
});