# [JavaScript] Sets

```
const weekdays = ['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun'];
const openingHours = {
  [weekdays[3]]: {
    open: 12,
    close: 22,
  },
  [weekdays[4]]: {
    open: 11,
    close: 23,
  },
  [weekdays[5]]: {
    open: 0, // Open 24 hours
    close: 24,
  },
};

const restaurant = {
  name: 'Classico Italiano',
  location: 'Via Angelo Tavanti 23, Firenze, Italy',
  categories: ['Italian', 'Pizzeria', 'Vegetarian', 'Organic'],
  starterMenu: ['Focaccia', 'Bruschetta', 'Garlic Bread', 'Caprese Salad'],
  mainMenu: ['Pizza', 'Pasta', 'Risotto'],

  // ES6 enhanced object literals
  openingHours,

  order(starterIndex, mainIndex) {
    return [this.starterMenu[starterIndex], this.mainMenu[mainIndex]];
  },

  orderDelivery({ starterIndex = 1, mainIndex = 0, time = '20:00', address }) {
    console.log(
      `Order received! ${this.starterMenu[starterIndex]} and ${this.mainMenu[mainIndex]} will be delivered to ${address} at ${time}.`
    );
  },

  orderPasta(ing1, ing2, ing3) {
    console.log(`Here is your delicious pasta with ${ing1}, ${ing2}, ${ing3}.`);
  },

  orderPizza(mainIngredient, ...otherIngredients) {
    console.log(mainIngredient);
    console.log(otherIngredients);
  },
};

///////////////////////////////
// Sets
const orderSet = new Set([
  'Pasta',
  'Pizza',
  'Pizza',
  'Risotto',
  'Pasta',
  'Pizza',
]);

console.log(orderSet);

console.log(new Set('Jonas'));

console.log(orderSet.size);

console.log(orderSet.has('Pizza'));
console.log(orderSet.has('Bread'));

orderSet.add('Garlic Bread');
orderSet.add('Garlic Bread');
console.log(orderSet);
orderSet.delete('Risotto');
console.log(orderSet);
console.log(orderSet[2]); // Set does not have index.
// orderSet.clear();
console.log(orderSet);

for (const order of orderSet) console.log(order);

//Example
const staff = ['Waiter', 'Chef', 'Waiter', 'Manager', 'Chef', 'Waiter'];
const staffUnique = [...new Set(staff)]; // set to array
console.log(staffUnique);
console.log(
  new Set(['Waiter', 'Chef', 'Waiter', 'Manager', 'Chef', 'Waiter']).size
);

console.log(new Set('jonasschmedtmann').size);
```

![Sets.PNG](https://cdn.hashnode.com/res/hashnode/image/upload/v1655223652119/RnmLrBI9c.PNG align="left")