how to check if a set is a subset of another set in typescript

To check if a set is a subset of another set in Typescript, you can utilize the includes and every methods available in the Set object. The includes method checks if a value is present in a set while the every method checks if all elements in an array satisfies a condition. Here's an example code snippet that demonstrates this:

index.ts
const setA: Set<number> = new Set([1, 2, 3, 4, 5]);
const setB: Set<number> = new Set([2, 4]);

const isSubset: boolean = Array.from(setB).every((value) => setA.has(value));

console.log(isSubset); // true
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In this example, setA is the superset while setB is the subset. We use the every method to iterate over each element of setB and check if it is present in setA using the has method. Finally, we get a boolean result indicating whether setB is a subset of setA or not.