ex6-totalCost.js

/*------------------------------------------------------------------------------
Full description at: https://github.com/HackYourFuture/Assignments/tree/main/1-JavaScript/Week3#exercise-6-total-cost-is

You want to buy a couple of things from the supermarket to prepare for a party.
After scanning all the items the cashier wants to give you the total price, but
the machine is broken! Let's write her a function that does it for her
instead!

1. Create an object named `cartForParty` with five properties. Each property
   should be a grocery item (like `beers` or `chips`) and hold a number value
   (like `1.75` or `0.99`).

2. Complete the function called `calculateTotalPrice`.

   - It takes one parameter: an object that contains properties that only contain
     number values.
   - Loop through the object and add all the number values together.
   - Return a string: "Total: €`amount`".

3. Complete the unit test functions and verify that all is working as expected.
-----------------------------------------------------------------------------*/
const cartForParty = {
  beer: 10,
  chips: 5,
  iceCream: 5.99,
  water: 4.50,
  salads: 19.25
};

function calculateTotalPrice(cartObj) {
  let finalPrice = 0

  for (let item in cartObj) {
    finalPrice += cartObj[item]
  }

  return `Total: ${finalPrice.toFixed(2)}.`
}

// ! Test functions (plain vanilla JavaScript)
function test1() {
  console.log('\nTest 1: calculateTotalPrice should take one parameter');
  const expected = 1
  const actual = calculateTotalPrice.length
  console.assert(expected === actual)
}

function test2() {
  console.log('\nTest 2: return correct output when passed cartForParty');
  const expected = `Total: 44.74.`
  const actual = calculateTotalPrice(cartForParty)
  console.assert(actual === expected)
}

function test() {
  test1();
  test2();
}

test();