Filter

filter.js

const orders = [
  {
    customerName: 'Nicolas',
    total: 60,
    delivered: true,
  },
  {
    customerName: 'Zulema',
    total: 120,
    delivered: false,
  },
  {
    customerName: 'Santiago',
    total: 180,
    delivered: true,
  },
  {
    customerName: 'Valentina',
    total: 240,
    delivered: true,
  },
];

const itemsTrue = orders.filter(item => () => {
  if (item.delivered === true) {
    return true;
  } else {
    return false;
  }
})
const itemsTrue = orders.filter(item => item.delivered === true)
const itemsTrue = orders.filter(item => item.total >= 100)
const itemsTrue = orders.filter(item => item.total >= 100 && item.total >= 200)
const itemsTrue = orders.filter(item => item.total >= 100 && item.total >= 200 && item.delivered)

orders.find(item => item.customerName === 'Valentina')
orders.every(item => item.total > 10)
orders.some(item => item.total === 240)

const total = orders
.filter(item => item.delivered)
.map((item) => {
  return {
    ...item,
    taxes: (16 * item.total) / 100
  };
})
.reduce((count, item) => count + item.taxes, 0);