byIndex method
Implementation
String byIndex(int index) {
switch (index) {
case 0:
return date;
case 1:
return open;
case 2:
return high;
case 3:
return low;
case 4:
return close;
case 5:
return changeAmount;
case 6:
return change;
case 7:
return amount;
}
throw UnimplementedError();
}