Explain the concept of the Set collection in JavaScript and its main features

The JavaScript Set collection is a data structure that stores unique values of any type, whether primitives or objects. Main features of Set:

• Stores only unique elements; duplicates are automatically ignored.
• Elements are ordered by insertion order.
• Allows quick existence checks with the has() method.
• Supports methods like add(), delete(), clear(), and iteration.

Example usage:

const mySet = new Set();
mySet.add(1);
mySet.add(5);
mySet.add(1); // will not be added again
console.log(mySet.has(5)); // true
mySet.delete(1);
console.log(mySet.size); // 1

for (const item of mySet) {
  console.log(item);
}