HORIZON PROJECT

var baseFindKey = require('./_baseFindKey'),

    baseForOwn = require('./_baseForOwn'),

    baseIteratee = require('./_baseIteratee');

/**

 * This method is like `_.find` except that it returns the key of the first

 * element `predicate` returns truthy for instead of the element itself.

 *

 * @static

 * @memberOf _

 * @since 1.1.0

 * @category Object

 * @param {Object} object The object to inspect.

 * @param {Function} [predicate=_.identity] The function invoked per iteration.

 * @returns {string|undefined} Returns the key of the matched element,

 *  else `undefined`.

 * @example

 *

 * var users = {

 *   'barney':  { 'age': 36, 'active': true },

 *   'fred':    { 'age': 40, 'active': false },

 *   'pebbles': { 'age': 1,  'active': true }

 * };

 *

 * _.findKey(users, function(o) { return o.age < 40; });

 * // => 'barney' (iteration order is not guaranteed)

 *

 * // The `_.matches` iteratee shorthand.

 * _.findKey(users, { 'age': 1, 'active': true });

 * // => 'pebbles'

 *

 * // The `_.matchesProperty` iteratee shorthand.

 * _.findKey(users, ['active', false]);

 * // => 'fred'

 *

 * // The `_.property` iteratee shorthand.

 * _.findKey(users, 'active');

 * // => 'barney'

 */

function findKey(object, predicate) {

  return baseFindKey(object, baseIteratee(predicate, 3), baseForOwn);

}

module.exports = findKey;