_.findKey(object, [predicate=_.identity])
This method is like _.find except that it returns the key of the first element predicate returns truthy for instead of the element itself.
Since
1.1.0
Arguments
-
object(Object): The object to inspect. -
[predicate=_.identity](Function): The function invoked per iteration.
Returns
(*): 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'
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