A cash register function

cashRegister.js

function checkCashRegister(price, cash, cid) {
  const denominationVals = {
    'ONE HUNDRED': 100,
    'TWENTY': 20,
    'TEN': 10,
    'FIVE': 5,
    'ONE': 1,
    'QUARTER': 0.25,
    'DIME': 0.1,
    'NICKEL': 0.050,
    'PENNY': 0.010
  }

  let changeSpecifics = {
    status: 'OPEN',
    change: []
  }

  let changeAmt = cash - price
  let slot = cid.length
  let slotAmts = []

  while (slot-- > 0) {
    let slotVal = denominationVals[cid[slot][0]]

    if (changeAmt >= slotVal) {
      let changeFromSlot = 0
      let slotAmt = cid[slot][1]
      while (slotAmt && (changeAmt >= slotVal)) {
        changeFromSlot += slotVal
        changeAmt -= slotVal
        slotAmt -= slotVal

        // Fix js rounding errors after subtracting floats
        changeAmt = Math.round(changeAmt * 100) / 100
        slotAmt = Math.round(slotAmt * 100) / 100
      }
      slotAmts.push(slotAmt)
      changeSpecifics.change.push([cid[slot][0], changeFromSlot])
    }
  }

  if (changeAmt > 0) {
    changeSpecifics.status = 'INSUFFICIENT_FUNDS'
    changeSpecifics.change = []
    return changeSpecifics
  }

  let allGone = true

  for (slot in slotAmts) {
    if (slotAmts[slot] > 0) {
      allGone = false
    }
  }

  if (allGone === true) {
    changeSpecifics.status = 'CLOSED'
    changeSpecifics.change = cid
    return changeSpecifics
  }

  return changeSpecifics
}