prefixToMatchDigitCount function
Implementation
String prefixToMatchDigitCount(int num, int digitCount) {
assert(digitCount > 1);
String prefix;
if (digitCount == 2)
prefix = num < 10 ? '0' : '';
else if (digitCount == 3)
prefix = num < 100 ? num < 10 ? '00' : '0' : '';
else if (digitCount == 4)
prefix = num < 1000 ? num < 100 ? num < 10 ? '000' : '00' : '0' : '';
else prefix = 'not imlemented';
return prefix;
}