Function isProperSupersetOf

Implementation of the proper superset operation in set theory, which checks if set A is a superset of set B. A proper superset means a set A is a superset of B, but B is not equal to A.

• Formal definition: A ⊃ B
• This method runs in bilinear time, or O(n * m), where n = |A| (size of set A), and m = |B| (set of size B)

Example

// {2, 3, 9} ⊃ {3, 9}
isProperSupersetOf(new Set([2, 3, 9]), new Set([3, 9])); // true
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