# Proposal: SuperSet

# Oğuz Kılıç (6 months ago)

As you know, the current Set feature is not sufficient in some aspects. We benefit from utility libraries or special implementations to fill this deficiency.

For example, wouldn’t it be better if we had the following approach?

UNION

``````X ∪ Y = { x | x ∈ X or x ∈ Y }
``````
``````let first = new SuperSet(["a", "b", "c"]);
let second = new SuperSet(["b", "c", "d", "e"]);

first.union(second); //→ SuperSet { "a", "b", "c", "d", "e" }
``````

DIFFERENCE

``````X - Y = { x | x ∈ X and x ∉ Y }
``````
``````let nums = new SuperSet([3, 4, 5, 6]);
let primes = new SuperSet([2, 3, 5, 7]);

nums.diff(primes); // → SuperSet { 4, 6 }
``````

INTERSECT

``````X ∩ Y = { x | x ∈ X and x ∈ Y }
``````
``````let nums = new SuperSet([3, 4, 5, 6]);
let primes = new SuperSet([2, 3, 5, 7]);
nums.intersect(primes); // → SuperSet { 3, 5 }
``````

``````let nums = new SuperSet([1, 2, 3, 4]);
nums.discard([1, 3]); // → SuperSet { 2, 4 }
``````

Motivation SuperSet - BYK/superset

# Григорий Карелин (6 months ago)

# Oğuz Kılıç (6 months ago)

Yes, I already consider it as an enriched version of the current set method, I just like calling it superset :)

# Jordan Harband (6 months ago)

Are you perhaps looking for tc39/proposal-set-methods ?

# Oğuz Kılıç (6 months ago)

yes. Sorry for not looking in detail.

Thanks.