mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? context(
    1. _ValueBuilderContext<T> value
    )?,
  2. TResult? ref(
    1. _ValueBuilderRef<T> value
    )?,
  3. TResult? value(
    1. _ValueBuilderValue<T> value
    )?,
})

A variant of map that fallback to returning null.

It is equivalent to doing:

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

Implementation

@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>({TResult? Function( _ValueBuilderContext<T> value)?  context,TResult? Function( _ValueBuilderRef<T> value)?  ref,TResult? Function( _ValueBuilderValue<T> value)?  value,}){
final _that = this;
switch (_that) {
case _ValueBuilderContext() when context != null:
return context(_that);case _ValueBuilderRef() when ref != null:
return ref(_that);case _ValueBuilderValue() when value != null:
return value(_that);case _:
  return null;

}
}