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44 lines
1.3 KiB
44 lines
1.3 KiB
var baseFindKey = require('./_baseFindKey'), |
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baseForOwn = require('./_baseForOwn'), |
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baseIteratee = require('./_baseIteratee'); |
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/** |
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* This method is like `_.find` except that it returns the key of the first |
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* element `predicate` returns truthy for instead of the element itself. |
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* |
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* @static |
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* @memberOf _ |
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* @since 1.1.0 |
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* @category Object |
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* @param {Object} object The object to inspect. |
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* @param {Function} [predicate=_.identity] The function invoked per iteration. |
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* @returns {string|undefined} Returns the key of the matched element, |
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* else `undefined`. |
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* @example |
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* |
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* var users = { |
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* 'barney': { 'age': 36, 'active': true }, |
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* 'fred': { 'age': 40, 'active': false }, |
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* 'pebbles': { 'age': 1, 'active': true } |
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* }; |
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* |
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* _.findKey(users, function(o) { return o.age < 40; }); |
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* // => 'barney' (iteration order is not guaranteed) |
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* |
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* // The `_.matches` iteratee shorthand. |
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* _.findKey(users, { 'age': 1, 'active': true }); |
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* // => 'pebbles' |
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* |
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* // The `_.matchesProperty` iteratee shorthand. |
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* _.findKey(users, ['active', false]); |
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* // => 'fred' |
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* |
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* // The `_.property` iteratee shorthand. |
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* _.findKey(users, 'active'); |
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* // => 'barney' |
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*/ |
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function findKey(object, predicate) { |
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return baseFindKey(object, baseIteratee(predicate, 3), baseForOwn); |
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} |
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module.exports = findKey;
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