mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? plain(
    1. RichTextPlain value
    )?,
  2. TResult? collection(
    1. RichTextCollection value
    )?,
  3. TResult? bold(
    1. RichTextBold value
    )?,
  4. TResult? italic(
    1. RichTextItalic value
    )?,
  5. TResult? underline(
    1. RichTextUnderline value
    )?,
  6. TResult? strikethrough(
    1. RichTextStrikethrough value
    )?,
  7. TResult? spoiler(
    1. RichTextSpoiler value
    )?,
  8. TResult? dateTime(
    1. RichTextDateTime value
    )?,
  9. TResult? textMention(
    1. RichTextTextMention value
    )?,
  10. TResult? subscript(
    1. RichTextSubscript value
    )?,
  11. TResult? superscript(
    1. RichTextSuperscript value
    )?,
  12. TResult? marked(
    1. RichTextMarked value
    )?,
  13. TResult? code(
    1. RichTextCode value
    )?,
  14. TResult? customEmoji(
    1. RichTextCustomEmoji value
    )?,
  15. TResult? mathematicalExpression(
    1. RichTextMathematicalExpression value
    )?,
  16. TResult? url(
    1. RichTextUrl value
    )?,
  17. TResult? emailAddress(
    1. RichTextEmailAddress value
    )?,
  18. TResult? phoneNumber(
    1. RichTextPhoneNumber value
    )?,
  19. TResult? bankCardNumber(
    1. RichTextBankCardNumber value
    )?,
  20. TResult? mention(
    1. RichTextMention value
    )?,
  21. TResult? hashtag(
    1. RichTextHashtag value
    )?,
  22. TResult? cashtag(
    1. RichTextCashtag value
    )?,
  23. TResult? botCommand(
    1. RichTextBotCommand value
    )?,
  24. TResult? anchor(
    1. RichTextAnchor value
    )?,
  25. TResult? anchorLink(
    1. RichTextAnchorLink value
    )?,
  26. TResult? reference(
    1. RichTextReference value
    )?,
  27. TResult? referenceLink(
    1. RichTextReferenceLink 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(RichTextPlain value)? plain,
  TResult? Function(RichTextCollection value)? collection,
  TResult? Function(RichTextBold value)? bold,
  TResult? Function(RichTextItalic value)? italic,
  TResult? Function(RichTextUnderline value)? underline,
  TResult? Function(RichTextStrikethrough value)? strikethrough,
  TResult? Function(RichTextSpoiler value)? spoiler,
  TResult? Function(RichTextDateTime value)? dateTime,
  TResult? Function(RichTextTextMention value)? textMention,
  TResult? Function(RichTextSubscript value)? subscript,
  TResult? Function(RichTextSuperscript value)? superscript,
  TResult? Function(RichTextMarked value)? marked,
  TResult? Function(RichTextCode value)? code,
  TResult? Function(RichTextCustomEmoji value)? customEmoji,
  TResult? Function(RichTextMathematicalExpression value)?
  mathematicalExpression,
  TResult? Function(RichTextUrl value)? url,
  TResult? Function(RichTextEmailAddress value)? emailAddress,
  TResult? Function(RichTextPhoneNumber value)? phoneNumber,
  TResult? Function(RichTextBankCardNumber value)? bankCardNumber,
  TResult? Function(RichTextMention value)? mention,
  TResult? Function(RichTextHashtag value)? hashtag,
  TResult? Function(RichTextCashtag value)? cashtag,
  TResult? Function(RichTextBotCommand value)? botCommand,
  TResult? Function(RichTextAnchor value)? anchor,
  TResult? Function(RichTextAnchorLink value)? anchorLink,
  TResult? Function(RichTextReference value)? reference,
  TResult? Function(RichTextReferenceLink value)? referenceLink,
}) {
  final _that = this;
  switch (_that) {
    case RichTextPlain() when plain != null:
      return plain(_that);
    case RichTextCollection() when collection != null:
      return collection(_that);
    case RichTextBold() when bold != null:
      return bold(_that);
    case RichTextItalic() when italic != null:
      return italic(_that);
    case RichTextUnderline() when underline != null:
      return underline(_that);
    case RichTextStrikethrough() when strikethrough != null:
      return strikethrough(_that);
    case RichTextSpoiler() when spoiler != null:
      return spoiler(_that);
    case RichTextDateTime() when dateTime != null:
      return dateTime(_that);
    case RichTextTextMention() when textMention != null:
      return textMention(_that);
    case RichTextSubscript() when subscript != null:
      return subscript(_that);
    case RichTextSuperscript() when superscript != null:
      return superscript(_that);
    case RichTextMarked() when marked != null:
      return marked(_that);
    case RichTextCode() when code != null:
      return code(_that);
    case RichTextCustomEmoji() when customEmoji != null:
      return customEmoji(_that);
    case RichTextMathematicalExpression() when mathematicalExpression != null:
      return mathematicalExpression(_that);
    case RichTextUrl() when url != null:
      return url(_that);
    case RichTextEmailAddress() when emailAddress != null:
      return emailAddress(_that);
    case RichTextPhoneNumber() when phoneNumber != null:
      return phoneNumber(_that);
    case RichTextBankCardNumber() when bankCardNumber != null:
      return bankCardNumber(_that);
    case RichTextMention() when mention != null:
      return mention(_that);
    case RichTextHashtag() when hashtag != null:
      return hashtag(_that);
    case RichTextCashtag() when cashtag != null:
      return cashtag(_that);
    case RichTextBotCommand() when botCommand != null:
      return botCommand(_that);
    case RichTextAnchor() when anchor != null:
      return anchor(_that);
    case RichTextAnchorLink() when anchorLink != null:
      return anchorLink(_that);
    case RichTextReference() when reference != null:
      return reference(_that);
    case RichTextReferenceLink() when referenceLink != null:
      return referenceLink(_that);
    case _:
      return null;
  }
}