Function findLastKey

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'

// 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'
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