Set

Collection of unique values.

Constructor

const s = new Set<string>();

Methods

s.add(value)

s.add("hello");
s.add("world");
s.add("hello");    // no-op, already exists

s.has(value)

if (s.has("hello")) {
  console.log("found");
}

s.delete(value)

s.delete("hello");    // boolean

s.size

console.log(s.size);    // number of unique elements