1  var ListCache = require('./_ListCache'),
 2      Map = require('./_Map'),
 3      MapCache = require('./_MapCache');
 4  
 5  /** Used as the size to enable large array optimizations. */
 6  var LARGE_ARRAY_SIZE = 200;
 7  
 8  /**
 9   * Sets the stack `key` to `value`.
10   *
11   * @private
12   * @name set
13   * @memberOf Stack
14   * @param {string} key The key of the value to set.
15   * @param {*} value The value to set.
16   * @returns {Object} Returns the stack cache instance.
17   */
18  function stackSet(key, value) {
19    var data = this.__data__;
20    if (data instanceof ListCache) {
21      var pairs = data.__data__;
22      if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
23        pairs.push([key, value]);
24        this.size = ++data.size;
25        return this;
26      }
27      data = this.__data__ = new MapCache(pairs);
28    }
29    data.set(key, value);
30    this.size = data.size;
31    return this;
32  }
33  
34  module.exports = stackSet;