RGB to Hex Color

gistfile1.txt

void main() {
  final colorConverter = ColorConverter();
  
  final hexColor = colorConverter.rgbToHex([255,255,255]);
  
  print(hexColor);
}

class ColorConverter {
  String rgbToHex(List<int> rgb) {
    if (!_isValidRGB(rgb))
      return "El RGB no es valido, debe ser un arreglo de 3 elementos, ejem: [255,255,255]";

    final red = _intToHex(rgb[0]);
    final green = _intToHex(rgb[1]);
    final blue = _intToHex(rgb[2]);

    return '#$red$green$blue'.toUpperCase();
  }

  bool _isValidRGB(List<int> rgb) => rgb.length == 3;

  String _intToHex(int value) {
    var hex = value.toRadixString(16);

    if (hex.length < 2) hex = '0$hex';

    return hex;
  }
}