humanizeInt function

String humanizeInt(int n)

Function that converts large numbers to humanized form
Returns same if number < 1000
Else Returns rounded number with appropriate suffix
Eg:

234 -> 234
1000 -> 1K
1234 -> 1.2K
12340 -> 12K
123400 -> 123K
1234000 -> 1.2M
....

Implementation

String humanizeInt(int n) {
  // < 1000
  if (n < 1000) return n.toString();

  // 1,000s
  if (n < 10000) {
    final s = (n / 1000).toStringAsFixed(1);
    if (s[s.length - 1] == '0') {
      return s.substring(0, s.length - 2) + "K";
    }
    return s + "K";
  }
  if (n < 1000000) {
    return (n / 1000).toStringAsFixed(0) + "K";
  }

  // 1,000,000s
  if (n < 10000000) {
    final s = (n / pow(1000, 2)).toStringAsFixed(1);
    if (s[s.length - 1] == '0') {
      return s.substring(0, s.length - 2) + "M";
    }
    return s + "M";
  }
  if (n < 1000000000) {
    return (n / pow(1000, 2)).toStringAsFixed(0) + "M";
  }

  // 1,000,000,000s
  if (n < 10000000000) {
    final s = (n / pow(1000, 3)).toStringAsFixed(1);
    if (s[s.length - 1] == '0') {
      return s.substring(0, s.length - 2) + "B";
    }
    return s + "B";
  }
  if (n < 1000000000000) {
    return (n / pow(1000, 3)).toStringAsFixed(0) + "B";
  }

  // 1,000,000,000,000s
  if (n < 10000000000000) {
    final s = (n / pow(1000, 4)).toStringAsFixed(1);
    if (s[s.length - 1] == '0') {
      return s.substring(0, s.length - 2) + "T";
    }
    return s + "T";
  }
  if (n < 1000000000000000) {
    return (n / pow(1000, 4)).toStringAsFixed(0) + "T";
  }

  // >= 1,000,000,000,000,000s

  return (n / pow(1000, 5)).toStringAsFixed(0) + "Q";
}