lodash/_stackHas.js

define(['./_assocHas'], function(assocHas) {

  /**
   * Checks if a stack value for `key` exists.
   *
   * @private
   * @name has
   * @memberOf Stack
   * @param {string} key The key of the entry to check.
   * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
   */
  function stackHas(key) {
    var data = this.__data__,
        array = data.array;

    return array ? assocHas(array, key) : data.map.has(key);
  }

  return stackHas;
});