the-CASH-DRAWER

function checkCashRegister(price, cash, cid) {
  // An array of objects with value of each bill or coin.
   const denomination = [
    {name: "ONE HUNDRED", value: 100.00},
    {name: "TWENTY", value: 20.00},
    {name: "TEN", value: 10.00},
    {name: "FIVE", value: 5.00},
    {name: "ONE", value: 1.00},
    {name: "QUARTER", value: 0.25},
    {name: "DIME", value: 0.10},
    {name: "NICKEL", value: 0.05},
    {name: "PENNY", value: 0.01}
  ];

  let change = cash - price;

  // Making an object from passed array to have a total cash value
  // And total each bill/coin value
  let cashAvailable =  cid.reduce((acca, current) => {
    acca.totalCash += current[1];
    acca[current[0]] = current[1];
    return acca;
  }, {totalCash: 0});

  let result = {status: null, change: []};

  // When change is exactly what's in a drawer
  if (change == cashAvailable.totalCash) {
    result.status = "CLOSED";
    result.change = cid;
    return result;
  }
  // When there is not enough change
  if (change > cashAvailable.totalCash) {
    result.status = "INSUFFICIENT_FUNDS";
    return result;
  }

  // Builds an array of returned change
  let changeDue = denomination.reduce((acca, current) => {
    let toReturn = 0;
    
    // While there is still money of this kind left
    // And while change is still more than the value of total of 
    // that denomination. 
    // ***To myself*** this problem is very similar to the number 
    // conversion to Roman numeral problem
    while (cashAvailable[current.name] > 0 && change >= current.value) {
      change = Math.round((change - current.value) * 100) / 100;
      cashAvailable[current.name] -= current.value;
      toReturn += current.value;
    }
    if (toReturn > 0) {
      acca.push([current.name, toReturn]);
    }
    // Return change
    return acca;
  }, [])
  
  // If there is nothing left in the drawer or we can't possibly
  // return it, return this:
  if (changeDue.length < 1 || change > 0) {
    result.status = "INSUFFICIENT_FUNDS";
    return result;
  }

  // Good evening
  result.status = "OPEN";
  result.change = changeDue;
  return result;
}

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]]);