| 1 | import baseFind from './_baseFind';
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| 2 | import baseForOwn from './_baseForOwn';
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| 3 | import baseIteratee from './_baseIteratee';
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| 4 |
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| 5 | /**
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| 6 | * This method is like `_.find` except that it returns the key of the first
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| 7 | * element `predicate` returns truthy for instead of the element itself.
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| 8 | *
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| 9 | * @static
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| 10 | * @memberOf _
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| 11 | * @since 1.1.0
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| 12 | * @category Object
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| 13 | * @param {Object} object The object to search.
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| 14 | * @param {Array|Function|Object|string} [predicate=_.identity]
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| 15 | * The function invoked per iteration.
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| 16 | * @returns {string|undefined} Returns the key of the matched element,
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| 17 | * else `undefined`.
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| 18 | * @example
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| 19 | *
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| 20 | * var users = {
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| 21 | * 'barney': { 'age': 36, 'active': true },
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| 22 | * 'fred': { 'age': 40, 'active': false },
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| 23 | * 'pebbles': { 'age': 1, 'active': true }
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| 24 | * };
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| 25 | *
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| 26 | * _.findKey(users, function(o) { return o.age < 40; });
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| 27 | * // => 'barney' (iteration order is not guaranteed)
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| 28 | *
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| 29 | * // The `_.matches` iteratee shorthand.
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| 30 | * _.findKey(users, { 'age': 1, 'active': true });
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| 31 | * // => 'pebbles'
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| 32 | *
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| 33 | * // The `_.matchesProperty` iteratee shorthand.
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| 34 | * _.findKey(users, ['active', false]);
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| 35 | * // => 'fred'
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| 36 | *
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| 37 | * // The `_.property` iteratee shorthand.
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| 38 | * _.findKey(users, 'active');
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| 39 | * // => 'barney'
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| 40 | */
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| 41 | function findKey(object, predicate) {
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| 42 | return baseFind(object, baseIteratee(predicate, 3), baseForOwn, true);
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| 43 | }
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| 44 |
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| 45 | export default findKey;
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