whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(int? borderWidth, @JsonKey.new(toJson: ColorKey.toJson, fromJson: ColorKey.fromJson) Color? backgroundColor, @JsonKey.new(toJson: ColorKey.toJson, fromJson: ColorKey.fromJson) Color? borderColor, int? borderRadius, @JsonKey.new(toJson: ColorKey.toJson, fromJson: ColorKey.fromJson) Color? cursorColor, @JsonKey.new(toJson: ColorKey.toJson, fromJson: ColorKey.fromJson) Color? textColor, int? fontSize, String? fontFamily, @JsonKey.new(toJson: ColorKey.toJson, fromJson: ColorKey.fromJson) Color? textErrorColor, @JsonKey.new(toJson: ColorKey.toJson, fromJson: ColorKey.fromJson) Color? placeholderColor,)?)

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( int? borderWidth, @JsonKey(toJson: ColorKey.toJson, fromJson: ColorKey.fromJson)  Color? backgroundColor, @JsonKey(toJson: ColorKey.toJson, fromJson: ColorKey.fromJson)  Color? borderColor,  int? borderRadius, @JsonKey(toJson: ColorKey.toJson, fromJson: ColorKey.fromJson)  Color? cursorColor, @JsonKey(toJson: ColorKey.toJson, fromJson: ColorKey.fromJson)  Color? textColor,  int? fontSize,  String? fontFamily, @JsonKey(toJson: ColorKey.toJson, fromJson: ColorKey.fromJson)  Color? textErrorColor, @JsonKey(toJson: ColorKey.toJson, fromJson: ColorKey.fromJson)  Color? placeholderColor)?  $default,) {final _that = this;
switch (_that) {
case _CardStyleConstructor() when $default != null:
return $default(_that.borderWidth,_that.backgroundColor,_that.borderColor,_that.borderRadius,_that.cursorColor,_that.textColor,_that.fontSize,_that.fontFamily,_that.textErrorColor,_that.placeholderColor);case _:
  return null;

}
}