.push()

Pushes an element into an array based on the provided key.

push(key, value)

Parameter	Description
key	String The key of the target array
value	Any The value to push into the array

Returns	Description
Any	The updated data from the provided key's root

db.get('people'); // ['Peter', 'Henry']

db.push('people', 'Catherine'); // ['Peter', 'Henry', 'Catherine']

Also allows the use of dot notation:

db.get('user'); // { id: 32171, items: ['sword'] }

db.push('user.items', 'axe'); // { id: 32171, items: ['sword', 'axe'] }