# convert method

Uint8List convert (String string, [ int start = 0, int end ])

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]) {
      int stringLength = string.length;
      RangeError.checkValidRange(start, end, stringLength);
      if (end == null) end = stringLength;
      int length = end - start;
      var result = new Uint8List(length);
      for (int i = 0; i < length; i++) {
        var codeUnit = string.codeUnitAt(start + i);
        if ((codeUnit & ~_subsetMask) != 0) {
          throw new ArgumentError("String contains invalid characters.");
        }
        result[i] = codeUnit;
      }
      return result;
    }