slice method

String slice([ int? start, int? end ])

Returns a new string that is a substring of this string. The substring begins at the specified start index and extends to the character at index end - 1.

If start is negative, it is treated as length + start where length is the length of the string.

If end is negative, it is treated as length + end where length is the length of the string.

If end is omitted, the slice includes all characters from start to the end of the string.

Implementation

String slice([int? start, int? end]) {
  start ??= 0;
  end ??= length;
  if (start < 0) {
    start = length + start;
  }
  if (end < 0) {
    end = length + end;
  }
  return substring(start, end);
}