mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? summary(
    1. UserIntent_Summary value
    )?,
  2. TResult? define(
    1. UserIntent_Define value
    )?,
  3. TResult? expandKnowledge(
    1. UserIntent_ExpandKnowledge value
    )?,
  4. TResult? general(
    1. UserIntent_General value
    )?,
  5. TResult? invalidCommand(
    1. UserIntent_InvalidCommand 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( UserIntent_Summary value)?  summary,TResult? Function( UserIntent_Define value)?  define,TResult? Function( UserIntent_ExpandKnowledge value)?  expandKnowledge,TResult? Function( UserIntent_General value)?  general,TResult? Function( UserIntent_InvalidCommand value)?  invalidCommand,}){
final _that = this;
switch (_that) {
case UserIntent_Summary() when summary != null:
return summary(_that);case UserIntent_Define() when define != null:
return define(_that);case UserIntent_ExpandKnowledge() when expandKnowledge != null:
return expandKnowledge(_that);case UserIntent_General() when general != null:
return general(_that);case UserIntent_InvalidCommand() when invalidCommand != null:
return invalidCommand(_that);case _:
  return null;

}
}