FreeCodeCamp: Cash Register

CashRegister.js

function checkCashRegister(price, cash, cid) {
  function floatPrecisionCorrection(x){
    return Math.round(x*100)/100;
  }
  let result={status:null,change:[]};

  let changeTotal=floatPrecisionCorrection(cash-price);

  let cidTotal=floatPrecisionCorrection(cid.reduce((a,e)=>a+e[1],0));

  if(changeTotal==cidTotal){
    result.status="CLOSED";
    result.change=cid;
    return result;
  }

  if(changeTotal>cidTotal){
    result.status="INSUFFICIENT_FUNDS";
    return result;
  }

     let hash=Object.create(null);
        hash["PENNY"]=0.01;
        hash["NICKEL"]=0.05;
        hash["DIME"]=0.1;
        hash["QUARTER"]=0.25;
        hash["ONE"]=1;
        hash["FIVE"]=5;
        hash["TEN"]=10;
        hash["TWENTY"]=20;
        hash["ONE HUNDRED"]=100;

        let changeback= cid.reduceRight(function(a,e){
          
          let changeEachUnit=Math.min(e[1],floatPrecisionCorrection(hash[e[0]]*Math.floor(changeTotal/hash[e[0]])));
          if(changeEachUnit>0){
          changeTotal=floatPrecisionCorrection(changeTotal-changeEachUnit);
          a.push([e[0],changeEachUnit]);
          }
          return a;
        },[]);

      if(changeTotal>0){
        result.status="INSUFFICIENT_FUNDS";
        return result;
      }

      result.status="OPEN";
      result.change=changeback;
      return result;
}

console.log(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]]));