MapJS

map.js

const numbers = [1,2,3,4];
// Mutable
for (let index = 0; index < numbers.length; index++) {
  numbers[index] = numbers[index] + 2;
}
console.log(numbers);

// Inmutable v1
const newNumbers = [];
for (let index = 0; index < numbers.length; index++) {
  newNumbers.push(numbers[index] + 2);
}
console.log(numbers, newNumbers);

// Inmutable v2
const newNumbersV2 = [];
numbers.forEach((item) => {
  newNumbersV2.push(item + 2);
});
console.log(numbers, newNumbersV2);

// Inmutable v3 (map)
const newNumbersV3 = numbers.map((item) => {
  return item + 2;
});
console.log(numbers, newNumbersV3);

// callback
function sumV1(item) {
  return item + 2;
}
const sumV2 = (item) => {
  return item + 2;
}
const sumV3 = (item) => item + 2;
const newNumbersV4 = numbers.map((item) => item + 2);
console.log(numbers, newNumbersV4);

// Objs 1

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 names = orders.map((item) => item.customerName);
const totals = orders.map((item) => item.total);
console.log(names);
console.log(totals);
console.log('-'.repeat(50));
console.log(orders);


// Objs 2

// const newOrders = orders.map((item) => {
//   const taxes = (16 * item.total) / 100;
//   item.taxes = taxes;
//   return item;
// });

// console.log(newOrders);
// console.log('-'.repeat(50));
// console.log(orders);

// Objs 3

const newOrdersV2 = orders
.map((item) => {
  return {
    ...item,
    taxes: (16 * item.total) / 100
  };
})


console.log(newOrdersV2);
console.log('-'.repeat(50));
console.log(orders);

// Objs 4

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

console.log(total);