Add a value to a set and create the set if it doesn't exist. Returns a
boolean where true means the value was inserted and false means the value
already exists in the set.
Remove a value from the set if it exists. Returns a boolean where
true means the operation was successful and false means the value doesn't exist
in the set.
Add a value to a set and create the set if it doesn't exist. Returns a boolean where
true
means the value was inserted andfalse
means the value already exists in the set.