how to get the cardinality of a set in typescript

To get the cardinality or size of a set in TypeScript, you can use the size property of the Set object. Here's an example:

index.ts
const mySet = new Set<string>();
mySet.add('apple');
mySet.add('banana');
mySet.add('cherry');
console.log(mySet.size); // output: 3
133 chars
6 lines

In this example, we create a new Set and add three elements to it using the add method. Then we log the size property of the Set which gives us the number of elements in the Set, also known as its cardinality.

Alternatively, you can also use the length property of an array created from a set to get the cardinality, like so:

index.ts
const mySet = new Set<string>();
mySet.add('apple');
mySet.add('banana');
mySet.add('cherry');
console.log(Array.from(mySet).length); // output: 3
147 chars
6 lines

In this case, we convert the Set to an array using the Array.from method and then get the length property of the resulting array to get the cardinality of the Set.