iredis/iredis/data/commands/exists.md

Returns if key exists.

The user should be aware that if the same existing key is mentioned in the arguments multiple times, it will be counted multiple times. So if somekey exists, EXISTS somekey somekey will return 2.

@return

@integer-reply, specifically the number of keys that exist from those specified as arguments.

@examples

SET key1 "Hello"
EXISTS key1
EXISTS nosuchkey
SET key2 "World"
EXISTS key1 key2 nosuchkey