Checking if a value exists in a list already Redis

Question

I\'m wondering if there\'s a way to check if a key already exists in a redis list?

I can\'t use a set because I don\'t want to enforce uniqueness, but I do want to be ab

Answer 1

You can also use LPOS.

When the item exists it returns a number indicating the position:

LPOS mylist myitem
3

When not it returns nill:

LPOS mylist myitem_which_do_not_exits
(nil)

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• Notes:

  • Available since 6.0.6.
  • Time complexity: O(N)
  • https://redis.io/commands/lpos