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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; | |