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 = {
  vine: 5.75,
  water: 0.73,
  juice: 1.26,
  croissant: 3.98,
  coffe: 2.33
};

function calculateTotalPrice(object) {
let total = 0;
  for (let item in object) {
    total += object[item];
  }
  return `Total: €${total.toFixed(2)}`;
}

//   Additional challenge: These lines go through all the keys in the object and add their values to total.
//   Another way is to use
//.  function calculateTotalPrice(object) {
//   let total = Object.values(object).reduce((sum, val) => sum + val, 0);
//   return `Total: €${total.toFixed(2)}`;
// }

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

function test2() {
  console.log('\nTest 2: return correct output when passed cartForParty');
  const expected = "Total: €14.05";
  const actual = calculateTotalPrice(cartForParty);
  console.assert(actual === expected, `Expected "${expected}", got "${actual}"`);
}

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

test();