lodash/_cacheHas.js

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

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

/**
 * Checks if `value` is in `cache`.
 *
 * @private
 * @param {Object} cache The set cache to search.
 * @param {*} value The value to search for.
 * @returns {number} Returns `true` if `value` is found, else `false`.
 */
function cacheHas(cache, value) {
  var map = cache.__data__;
  if (isKeyable(value)) {
    var data = map.__data__,
        hash = typeof value == 'string' ? data.string : data.hash;

    return hash[value] === HASH_UNDEFINED;
  }
  return map.has(value);
}

module.exports = cacheHas;