sequence.sum([field | function]) → number
r.sum(sequence, [field | function]) → number
Sums all the elements of a sequence. If called with a field name,
sums 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 sums the
results, skipping elements of the sequence where that function returns
null or a non-existence error.
Returns 0 when called on an empty sequence.
Example: What’s 3 + 5 + 7?
r.expr([3, 5, 7]).sum().run(conn, callback)
Example: How many points have been scored across all games?
r.table('games').sum('points').run(conn, callback)
Example: How many points have been scored across all games, counting bonus points?
r.table('games').sum(function(game) {
return game('points').add(game('bonus_points'))
}).run(conn, callback)
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