whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? context(
    1. T? builder(
      1. BuildContext context
      )
    )?,
  2. TResult? ref(
    1. T? builder(
      1. ProviderReader reader
      )
    )?,
  3. TResult? value(
    1. T? value
    )?,
})

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( T? Function(BuildContext context) builder)?  context,TResult? Function( T? Function(ProviderReader reader) builder)?  ref,TResult? Function( T? value)?  value,}) {final _that = this;
switch (_that) {
case _ValueBuilderContext() when context != null:
return context(_that.builder);case _ValueBuilderRef() when ref != null:
return ref(_that.builder);case _ValueBuilderValue() when value != null:
return value(_that.value);case _:
  return null;

}
}