fcc-cash-register

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

function checkCashRegister(price, cash, cid) {
  //reference for currency values
  const currency = {
    'ONE HUNDRED': 100.00,
    'TWENTY': 20.00,
    'TEN': 10.00,
    'FIVE': 5.00,
    'ONE': 1.00,
    'QUARTER': 0.25,
    'DIME': 0.10,
    'NICKEL': 0.05,
    'PENNY': 0.01
  };

  //get register total
  const regTotal = () => {
    const total = cid.reduce((acc, cur) => acc + cur[1], 0).toFixed(2);
    return total;
  }
  
  //debugging
  console.log('register total is: ' + regTotal());

  //object constructors
  const change = (status, change) =>({
    status,
    change
  })
  const customerHand = {
    status: 'OPEN',
    change: []
  };

  //pre-check
  let changeDue = cash - price;
  if(changeDue == regTotal()) {
    return change("CLOSED", cid);
  }
  if(changeDue > regTotal()) {
    return change("INSUFFICIENT_FUNDS", []);
  }

  //iterate thru cid array right to left
  for(var i = cid.length - 1; i >= 0; i--) {
    let denomination = cid[i][0];
    let amount = cid[i][1];
    let count = 0;
    //find the right currency amount
    while(changeDue >= amount && amount > 0) {
      changeDue -= changeDue;
      amount -= amount;
      count++;
    }
    if(count > 0) {
      customerHand.status = 'OPEN'
      customerHand.change.push([denomination, (count * currency[denomination])]);
    } else { 
      customerHand.status = 'INSUFFICIENT_FUNDS'
    }
  }
  console.log(customerHand);
  
  return customerHand;
}

checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 1], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]);