singleSelection.keys() → array object.keys() → array
Return an array containing all of an object’s keys. Note that the keys will be sorted as described in ReQL data types (for strings, lexicographically).
Example: Get all the keys from a table row.
// row: { id: 1, mail: "[email protected]", name: "fred" }
r.table('users').get(1).keys().run(conn, callback);
// Result passed to callback
[ "id", "mail", "name" ]
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https://rethinkdb.com/api/javascript/keys/