r.floor(number) → number number.floor() → number
Rounds the given value down, returning the largest integer value less than or equal to the given value (the value’s floor).
Example: Return the floor of 12.345.
r.floor(12.345).run(conn); // Result: 12.0
The floor command can also be chained after an expression.
Example: Return the floor of -12.345.
r.expr(-12.345).floor().run(conn); // Result: -13.0
Example: Return Iron Man’s weight, rounded down with floor.
r.table("superheroes").get("ironman").g("weight").floor().run(conn);
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https://rethinkdb.com/api/java/floor/