24 lines
690 B
Markdown
24 lines
690 B
Markdown
---
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title: superSet
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tags: array,intermediate
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firstSeen: 2020-10-11T11:53:19+03:00
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lastUpdated: 2020-10-22T20:24:30+03:00
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---
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Checks if the first iterable is a superset of the second one, excluding duplicate values.
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- Use the `new Set()` constructor to create a new `Set` object from each iterable.
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- Use `Array.prototype.every()` and `Set.prototype.has()` to check that each value in the second iterable is contained in the first one.
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```js
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const superSet = (a, b) => {
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const sA = new Set(a), sB = new Set(b);
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return [...sB].every(v => sA.has(v));
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};
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```
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```js
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superSet(new Set([1, 2, 3, 4]), new Set([1, 2])); // true
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superSet(new Set([1, 2, 3, 4]), new Set([1, 5])); // false
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```
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