hidePartial method

String? hidePartial({ int begin = 0, int? end, String replace = '*', })

Replaces chars of the given String s with replace.

The default value of replace is *. begin determines the start of the 'replacing'. If begin is null, it starts from index 0. end defines the end of the 'replacing'. If end is null, it ends at s length divided by 2. If s is empty or consists of only 1 char, the method returns null.

Example : 1234567890 => *****67890 1234567890 with begin 2 and end 6 => 127890 1234567890 with begin 1 => 167890

Implementation

String? hidePartial({int begin = 0, int? end, String replace = '*'}) {
  final buffer = StringBuffer();
  if (length <= 1) {
    return null;
  }
  if (end == null) {
    end = (length / 2).round();
  } else {
    if (end > length) {
      end = length;
    }
  }
  for (var i = 0; i < length; i++) {
    if (i >= end) {
      buffer.write(String.fromCharCode(runes.elementAt(i)));
      continue;
    }
    if (i >= begin) {
      buffer.write(replace);
      continue;
    }
    buffer.write(String.fromCharCode(runes.elementAt(i)));
  }
  return buffer.toString();
}