formatBytesToHuman function

String formatBytesToHuman(int bytes, { int decimals = 1, })

Formats a byte count in bytes into a human-readable size string.

Scales by 1024 through the suffixes B, KB, ..., EB, using up to decimals fractional digits with trailing zeros trimmed. Whole values and values 10 or larger are shown without decimals. Zero yields 0 B; negative counts are prefixed with -.

Example:

formatBytesToHuman(1572864); // '1.5 MB'
formatBytesToHuman(0); // '0 B'

Implementation

String formatBytesToHuman(int bytes, {int decimals = 1}) {
  if (bytes < 0) return '-${formatBytesToHuman(-bytes, decimals: decimals)}';
  if (bytes == 0) return _kSizeZeroB;
  int i = 0;
  double v = bytes.toDouble();
  while (v >= 1024 && i < _sizeSuffixes.length - 1) {
    v /= 1024;
    i++;
  }
  final String formatted = v >= 10 || v == v.truncateToDouble()
      ? v.truncate().toString()
      : v.toStringAsFixed(decimals).replaceAll(RegExp(r'0+$'), '').replaceAll(RegExp(r'\.$'), '');
  return '$formatted ${_sizeSuffixes[i]}';
}