The add() method can be used to add
a value to the end of a Set.
In the example given above:
-
truthyValues.add(56.78) adds the element 56.78
to the end of the set truthyValues.
-
truthyValues.add("apple") should add the element "apple"
to the end of the set truthyValues.
However, truthyValues already has an element
with the value "apple".
Hence the element "apple" is not added to truthyValues.