forEach vs. for in javascript does not come out the same

function checkCashRegister(price, cash, cid) {
debugger;
  var toReturn = cash - price;
  var cashArray = [0.01, 0.05, 0.1, 0.25, 1, 5, 10, 20, 100];
  var counter = 0;
  var total = 0;
  var result = {
    status: "",
    change: [["ONE HUNDRED", 0], ["TWENTY", 0], ["TEN", 0], ["FIVE", 0], ["DOLLAR", 0], ["QUARTER", 0], ["DIME", 0], ["NICKEL", 0], ["PENNY", 0]]
  }
  
  total = cid.reduce(function(acc,val){
    return (acc * 100 + val[1] * 100) / 100;
  },0);

  if(total < toReturn){
    result.status = "INSUFFICIENT_FUNDS";
    result.change = [];
    return result;
  } else if(total == toReturn){
    result.status = "CLOSED";
    result.change = cid;
    return result;
  } else {
    result.status = "OPEN";
    
    cid.forEach ( function (i, a){
      while([i][0][1] > 0 && toReturn - cashArray[a] >= 0){
        [i][0][1] = Math.round(([i][0][1] - cashArray[a]) * 100) / 100;
        result.change[counter][1] += cashArray[a];
        toReturn = toReturn - cashArray[a];
        var b = Math.round(toReturn * 100);
        toReturn = b / 100;
    }
    counter++;
    })
    
/*for(var i = cid.length - 1; i >= 0; i--){
      while(cid[i][1] > 0 && toReturn - cashArray[i] >= 0){
        cid[i][1] = cid[i][1] - cashArray[i];
        result.change[counter][1] += cashArray[i];
        toReturn = toReturn - cashArray[i];
        var b = Math.round(toReturn * 100);
        toReturn = b / 100;
      }
    counter++
  }
  }*/
  if (toReturn != 0){
    result.status = "INSUFFICIENT_FUNDS";
    result.change = [];
    return result;
  }
  var filtered = result.change.filter(function(x){
    return x[1] > 0;
  });
  result.change = filtered;
  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]]);