1  /**
 2   * The base implementation of methods like `_.findKey` and `_.findLastKey`,
 3   * without support for iteratee shorthands, which iterates over `collection`
 4   * using `eachFunc`.
 5   *
 6   * @private
 7   * @param {Array|Object} collection The collection to inspect.
 8   * @param {Function} predicate The function invoked per iteration.
 9   * @param {Function} eachFunc The function to iterate over `collection`.
10   * @returns {*} Returns the found element or its key, else `undefined`.
11   */
12  function baseFindKey(collection, predicate, eachFunc) {
13    var result;
14    eachFunc(collection, function(value, key, collection) {
15      if (predicate(value, key, collection)) {
16        result = key;
17        return false;
18      }
19    });
20    return result;
21  }
22  
23  module.exports = baseFindKey;