dart:convert

convert method

Uint8List convert (

1. String string,
2. [int start = 0,
3. int? end]

)

inherited

Converts the String into a list of its code units.

If start and end are provided, only the substring string.substring(start, end) is used as input to the conversion.

Implementation

Uint8List convert(String string, [int start = 0, int? end]) {
  var stringLength = string.length;
  end = RangeError.checkValidRange(start, end, stringLength);
  // TODO(38725): Remove workaround when assignment promotion is implemented
  if (end == null) {
    throw RangeError("Invalid range");
  }
  var length = end - start;
  var result = Uint8List(length);
  for (var i = 0; i < length; i++) {
    var codeUnit = string.codeUnitAt(start + i);
    if ((codeUnit & ~_subsetMask) != 0) {
      throw ArgumentError.value(
          string, "string", "Contains invalid characters.");
    }
    result[i] = codeUnit;
  }
  return result;
}