findLastKey source npm
_.findLastKey(object, [predicate=_.identity])
This method is like _.findKey
except that it iterates over elements of
a collection in the opposite order.
Arguments
- object (Object)
The object to search.
- [predicate=_.identity] (Function|Object|string)
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 }
};
_.findLastKey(users, function(o) { return o.age < 40; });
// => returns 'pebbles' assuming `_.findKey` returns 'barney'
// using the `_.matches` callback shorthand
_.findLastKey(users, { 'age': 36, 'active': true });
// => 'barney'
// using the `_.matchesProperty` callback shorthand
_.findLastKey(users, ['active', false]);
// => 'fred'
// using the `_.property` callback shorthand
_.findLastKey(users, 'active');
// => 'pebbles'