sequence.avg([field | function]) → number r.avg(sequence, [field | function]) → number
Averages all the elements of a sequence. If called with a field name, averages all the values of that field in the sequence, skipping elements of the sequence that lack that field. If called with a function, calls that function on every element of the sequence and averages the results, skipping elements of the sequence where that function returns nil or a non-existence error.
Produces a non-existence error when called on an empty sequence. You can handle this case with default.
Example: What’s the average of 3, 5, and 7?
r([3, 5, 7]).avg().run(conn)
Example: What’s the average number of points scored in a game?
r.table('games').avg('points').run(conn)
Example: What’s the average number of points scored in a game, counting bonus points?
r.table('games').avg{|game| game['points'] + game['bonus_points']}.run(conn)
Example: What’s the average number of points scored in a game? (But return nil instead of raising an error if there are no games where points have been scored.)
r.table('games').avg('points').default(nil).run(conn)
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