javascript set

https://alligator.io/js/sets-introduction/

let animals = new Set();

animals.add('🐷');
animals.add('🐼');
animals.add('🐢');
animals.add('🐿');
console.log(animals.size); // 4
animals.add('🐼');
console.log(animals.size); // 4

console.log(animals.has('🐷')); // true
animals.delete('🐷');
console.log(animals.has('🐷')); // false

animals.forEach(animal => {
  console.log(\`Hey ${animal}!\`);
});

// Hey 🐼!
// Hey 🐢!
// Hey 🐿!

animals.clear();
console.log(animals.size); // 0

let myAnimals = new Set(['🐷', '🐢', '🐷', '🐷']);

myAnimals.add(['🐨', '🐑']);
myAnimals.add({ name: 'Rud', type: '🐢' });
console.log(myAnimals.size); // 4

myAnimals.forEach(animal => {
  console.log( animal );
});


// 🐷
// 🐢
// ["🐨", "🐑"]
// Object { name: "Rud", type: "🐢" }