Hashset.contains_relational

contains_relationalvalue

Group: Logical

Documentation

Checks if this set contains a given value, treating Nothing as a relational NULL. If the argument is non-Nothing and exists in value, return true. If the argument is non-Nothing and does not exist in value, return false if value does not contain a Nothing, or Nothing if value does contain a Nothing. If the argument is Nothing, return Nothing if value is non-empty, or false if value is empty.