lodash/_SetCache.js

define(['./_MapCache', './_cachePush'], function(MapCache, cachePush) {

  /**
   *
   * Creates a set cache object to store unique values.
   *
   * @private
   * @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.push(values[index]);
    }
  }

  // Add functions to the `SetCache`.
  SetCache.prototype.push = cachePush;

  return SetCache;
});