array.setUnion(array) → array
Add a several values to an array and return it as a set (an array with distinct values).
Example: Retrieve Iron Man’s equipment list with the addition of some new boots and an arc reactor.
r.table('marvel').get('IronMan')('equipment').setUnion(['newBoots', 'arc_reactor']).run(conn, callback)
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https://rethinkdb.com/api/javascript/set_union/