var isKeyable = require('./_isKeyable');

/** Used to stand-in for `undefined` hash values. */
var HASH_UNDEFINED = '__lodash_hash_undefined__';

/**
 * Adds `value` to the set cache.
 *
 * @private
 * @name push
 * @memberOf SetCache
 * @param {*} value The value to cache.
 */
function cachePush(value) {
  var map = this.__data__;
  if (isKeyable(value)) {
    var data = map.__data__,
        hash = typeof value == 'string' ? data.string : data.hash;

    hash[value] = HASH_UNDEFINED;
  }
  else {
    map.set(value, HASH_UNDEFINED);
  }
}

module.exports = cachePush;