Cash register guidance

1

Hi,

I’m just doing some testing to see what does and doesn’t work, and for some reason I can’t get this code to pass the last test:

function checkCashRegister(price, cash, cid) {
  let till = cid.reverse();
  let tillTotal = parseFloat(till.reduce((preVal, curVal) => preVal + curVal[1], 0).toFixed(2));
  let change = cash - price;

  if (tillTotal === change) {
    return {status: "CLOSED", change: cid};
  }
}

If I paste in the ‘cid’ array directly it passes but it doesn’t if I insert as a variable, is there something I’m missing here?

Thanks.

2

does reverse change the array on which it is used?

1 Like
3

Yes it does. It changes the array in place and returns (a reference to) the reversed array.

(I don’t know if you were sincerely asking, or trying to give bayzoo a hint. Sorry if it is the latter :flushed:)

1 Like
4

Thanks both for saving my sanity - last time I try to code and look after a 1 yr old at the same time… amended code below:

function checkCashRegister(price, cash, cid) {
  let till = [...cid].reverse();
  let tillTotal = parseFloat(till.reduce((preVal, curVal) => preVal + curVal[1], 0).toFixed(2));
  let change = cash - price;

  if (tillTotal === change) {
    return {status: "CLOSED", change: cid};
  }
}
5

Hello @bayzoo,

Glad we could help solve your problem!

Another way you could go about this would be to declare till as a copy of cid then reverse till.

let till = cid
till.reverse()
1 Like
6

Excellent, thanks! It’s good to see different ways of achieving the same result. I achieved my JS certification last night, so I’m pretty happy now I can get started on some projects.

7

Awesome to hear! Good luck on the projects. In my opinion, the projects are the most fun part of learning to code.

1 Like