peekChar method Null safety

int? peekChar(
  1. [int? offset]
)

Returns the character code of the character offset away from position.

offset defaults to zero, and may be negative to inspect already-consumed characters.

This returns null if offset points outside the string. It doesn't affect lastMatch.

Implementation

int? peekChar([int? offset]) {
  offset ??= 0;
  final index = position + offset;
  if (index < 0 || index >= string.length) return null;
  return string.codeUnitAt(index);
}