ReQL command reference - RethinkDB
Command syntax
array.setDifference(array) → array
Description
Remove the elements of one array from another and return them as a set (an array with distinct values).
Example: Check which pieces of equipment Iron Man has, excluding a fixed list.
r.table("marvel").get("IronMan").g("equipment")
.setDifference(r.array("newBoots", "arc_reactor")).run(conn);