Pizza Filter (long and short form example)

pizza-filter-long.js

// Long form example
const pizzas = [
  {
    name: 'Margarita',
    toppings: ['Cheese', 'Tomato']
  },
  {
    name: 'Hawaiian',
    toppings: ['Cheese', 'Tomato', 'Ham', 'Pineapple']
  },
  {
    name: 'Ham and Mushroom',
    toppings: ['Cheese', 'Tomato', 'Ham', 'Mushroom']
  },
  {
    name: 'Pepperoni',
    toppings: ['Cheese', 'Tomato', 'Pepperoni']
  },
  {
    name: 'Vegetable',
    toppings: ['Cheese', 'Tomato', 'Peppers', 'Mushroom']
  },
]

const meats = ['Ham', 'Pepperoni']

// Set 'vegetarian' to 'true' on pizzas that don't contain meats (and 'false' if they do)
pizzas.forEach(function(pizza) {
  let pizzaHasMeat = false

  meats.forEach(function(meat) {
    pizza.toppings.forEach(function(topping) {
      if (topping === meat) {
        pizzaHasMeat = true
      }
    })
  })

  if (pizzaHasMeat) {
    pizza.vegetarian = false
  } else {
    pizza.vegetarian = true
  }
})

// Filter by pizzas where vegetarian is true, and return just the names
const vegetarianPizzasByName = []
pizzas.forEach(function(pizza) {
  if (pizza.vegetarian) {
    vegetarianPizzasByName.push(pizza.name)
  }
})

console.log('Vegetarian Pizzas:', vegetarianPizzasByName)

pizza-filter-short.js

// Short form example
const pizzas = [
  {
    name: 'Margarita',
    toppings: ['Cheese', 'Tomato']
  },
  {
    name: 'Hawaiian',
    toppings: ['Cheese', 'Tomato', 'Ham', 'Pineapple']
  },
  {
    name: 'Ham and Mushroom',
    toppings: ['Cheese', 'Tomato', 'Ham', 'Mushroom']
  },
  {
    name: 'Pepperoni',
    toppings: ['Cheese', 'Tomato', 'Pepperoni']
  },
  {
    name: 'Vegetable',
    toppings: ['Cheese', 'Tomato', 'Peppers', 'Mushroom']
  },
]

const meats = ['Ham', 'Pepperoni']

// Set 'vegetarian' to 'true' on pizzas that don't contain meats (and 'false' if they do)
pizzas.map(pizza => pizza.vegetarian = !meats.some(meat => pizza.toppings.includes(meat)) )

// Filter by pizzas where vegetarian is true, and return just the names
console.log('Vegetarian Pizzas:', pizzas.filter(pizza => pizza.vegetarian).map(pizza => pizza.name))