Cash Register Help!

JavaScript
1

Tell us what’s happening:
Currently getting 3 of the test to pass, but like some other people finding a weird JS math error I can’t seem to correct. Any advice would be appreciated.

Your code so far


function checkCashRegister(price, cash, cid) {
  let output = {status: '', change: []};
  let change = cash - price;
  let cidTotal = [];
  for(let x in cid){
    cidTotal.push(cid[x][1]);
  }
  cidTotal = cidTotal.reduce((a,b) => a + b).toFixed(2);
  //making sure these values make sense
  //console.log(cidTotal);
  //console.log(change)
  if(cidTotal < change){
    output.status = "INSUFFICIENT_FUNDS";
    return output;
  } else {
    if(cidTotal === change){
      output.status = "CLOSED";
      output.change = [...cid];
      return output;
    }
  }
const denominations = [
  {"name":"PENNY","value":0.01},
  {"name":"NICKEL","value":0.05},
  {"name":"DIME","value":0.10},
  {"name":"QUARTER","value":0.25},
  {"name":"ONE","value":1},
  {"name":"FIVE","value":5},
  {"name":"TEN","value":10},
  {"name":"TWENTY","value":20},
  {"name":"HUNDRED","value":100}]


let answer = [];
let tracker = 0;

for(let i = cid.length -1; i >= 0; i--){
    while(change >= denominations[i].value  && tracker < cid[i][1]){
      change  -= denominations[i].value
     //here seems to be where the math error happens, but can't figure out
     //how to fix it
     // console.log(change)  
      tracker += denominations[i].value 
      } if(tracker > 0){
    answer.push([denominations[i].name, tracker]);
  } tracker = 0
}
  
// Here is your change, ma'am.
output.status = 'OPEN';
output.change = answer;
  return output;
}

console.log(JSON.stringify(checkCashRegister(3.26, 100, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])));

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/cash-register

2

The tip I give people on this challenge is to do your math on “cents” rather than “dollars”. In other words, multiply everything by 100 so that a penny is a whole number.

1 Like
3

Wow thanks! That did it!! This feels great!

4

Glad to help. Happy coding!