Lodash

findLastKey

Object
since 2.0.0

Arguments

  • Object The object to inspect.
  • Function The function invoked per iteration.

Returns

string|undefined the key of the matched element, else `undefined`.

This method is like _.findKey except that it iterates over elements of a collection in the opposite order.

Example of Lodash _.findLastKey

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'

// The `_.matches` iteratee shorthand.
_.findLastKey(users, { 'age': 36, 'active': true });
// => 'barney'

// The `_.matchesProperty` iteratee shorthand.
_.findLastKey(users, ['active', false]);
// => 'fred'

// The `_.property` iteratee shorthand.
_.findLastKey(users, 'active');
// => 'pebbles'