JavaScript Algorithms and Data Structures Projects - Cash Register

JavaScript
1

Tell us what’s happening:
Asking for someone to point out the problem.
Not getting the expected output of { status: OPEN, change: [[“QUARTER”, 0.5]] }

Your code so far

function checkCashRegister(price, cash, cid) {
  const change = cash - price;
  //changeDue is the amount of money to be given to the customer
  let changeDue = [["PENNY", 0], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]];

  //cashReg is cid and the representation of the cash register
  let cashReg =  [...cid];

  //moneyUnit is the denomination of each bill contained in the cash register. It is arranged in accordance of order in the cash register
  let moneyUnit = [0.01, 0.05, 0.1, 0.25, 1, 5, 10, 20, 100];
  
  //Declare two variables denoting status of cash register and changeDue respectively
  let _status, _change;
  
  //Create an IIFE that will check the amount of the cash register to decide whether to call another function or not
  ( function() {
    //Check the amount of the cash register
    let cashRegContent = cashReg.reduce( ((total,entry) => total + entry[1]),0);
    cashRegContent = cashRegContent.toFixed(2);
    cashRegContent = parseFloat(cashRegContent);
    
    //When the total amount of the cash register is equal to the chnange
    if ( cashRegContent === change ) {_status = "CLOSED"; _change = cid}
    //When the total amount of the cash register is less than the change
    else if ( cashRegContent < change ) {_status = "INSUFFICIENT FUNDS"; _change = []}
    //Call a function when the total amount of the cash register is more than the change
    else if ( cashRegContent > change) { processChange(); } 
    }) ();
  

// Function processChange will check if the given denomination of bill can provide for the change
    function processChange() {
    //For each denomination, bal is the amount of the preceeding denominations in the ChangeDue
    //Iteration starts from the end of the array
    for (let j = cashReg.length - 1 ; j<0 ; j--) {
      let bal = changeDue.slice(j+1).reduce( ((total,entry) => total + entry[1]),0);
      bal = bal.toFixed(2);
      bal = parseFloat(bal);
      //partial is the amount to take from cashReg before putting it to the ChangeDue
      let partial = 0;
      while ( (bal + partial + moneyUnit[j]) <= change && cashReg[j][1] > 0) {
        partial += moneyUnit[j];
        cashReg[j][1] -= moneyUnit[j];
      }
      changeDue[j][1] = partial; 
    }
    }

  let balance = changeDue.reduce( ((total,entry) => total + entry[1]),0);
  balance = balance.toFixed(2);
  balance = parseFloat(balance);
  //console.log(balance);
  //console.log(changeDue);

  //Depending on the value of balance, call a function and set the corresponding values to variables _status and _change
  if (balance === change) { trim(); _status = "OPEN" ; _change = changeDue}
  else if (balance < change) {_status = "INSUFFICIENT FUNDS"; _change = [] }
  
  function trim() { changeDue = changeDue.filter(entry => {return entry[1] !== 0} )}
  
  let regStat = {status: _status, change: _change};
  return regStat;
  
}

checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]]);


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**Challenge:**  JavaScript Algorithms and Data Structures Projects - Cash Register

**Link to the challenge:**
https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/cash-register
2

With your code right now im getting { status: 'INSUFFICIENT FUNDS', change: [] }. I would recommend tossing some console.logs around where you are changing your _status and _change to those values and see if you can back track all the way to the problem. I got it to return { status: OPEN, change: [[“QUARTER”, 0.5]] } by changing one character in your code, but it was still failing all the other tests.

3

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