Set

Store unique values with fast lookup. Good for deduplication or tracking seen items.

class CustomSet {
  private items: { [key: string]: boolean };

  constructor() {
    this.items = {};
  }

  // Add an element
  add(value: string): void {
    this.items[value] = true;
  }

  // Check if an element exists
  has(value: string): boolean {
    return this.items[value] === true;
  }

  // Remove an element
  remove(value: string): void {
    delete this.items[value];
  }
}

const set = new CustomSet();
set.add("apple");
set.add("banana");
console.log(set.has("apple")); // Output: true
console.log(set.has("orange")); // Output: false
set.remove("apple");
console.log(set.has("apple")); // Output: false

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