incrbyex

Increment a value only if it exists

Returns New value of the counter if found, otherwise nil
Keys
  1. Key used as a counter, which may or may not exist
Args
  1. Amount to increment the value by

Example

> evalsha f74dd5c086898b8a3d69655334b94fa7e006a9b1 1 activeusers 1
(nil)
> set activeusers 0
OK
> evalsha f74dd5c086898b8a3d69655334b94fa7e006a9b1 1 activeusers 1
(integer) 1
> evalsha f74dd5c086898b8a3d69655334b94fa7e006a9b1 1 activeusers 2
(integer) 3

Source

if redis.call("EXISTS",KEYS[1]) == 1 then
  return redis.call("INCRBY",KEYS[1],ARGV[1])
else
  return nil
end

SHA

f74dd5c086898b8a3d69655334b94fa7e006a9b1

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Last updated 31 Jul 2014.

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