whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String label,
    2. RichAction action,
    3. String style,
    4. String? icon,
    )?
)

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( String label,  RichAction action,  String style,  String? icon)?  $default,) {final _that = this;
switch (_that) {
case _RichButton() when $default != null:
return $default(_that.label,_that.action,_that.style,_that.icon);case _:
  return null;

}
}