How to omit second condition

Question

How to omit second condition in conditional statement?

    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        message != null
            ? Padding(
                padding: const EdgeInsets.all(24.0),
                child: Text(message),
              )
            : null, // how to omit second condition?
      ],
    );

Wheh the second condition is null I get

════════ Exception caught by widgets library ════════ The following assertion was thrown building ExportData(dirty, state: _ExportDataState#e723d): Column's children must not contain any null values, but a null value was found at index 4

@pskink Wow thanks. Don't you think it should be the answer then? :) — bereal, May 03 '20 at 07:54
@bereal see https://dart.dev/guides/language/language-tour and type `^F promoActive` — pskink, May 03 '20 at 07:55
@pskink yeah, found. Awesome, sorry about the hasty comment. — bereal, May 03 '20 at 07:58
@bereal hasty? what hasty? you were just curious... btw notice that you can use `for` loop too... — pskink, May 03 '20 at 08:01
@pskink Yeah, I just thought my comment could sound a bit aggressive, you never know in the internets. I think, this should be the actual answer. — bereal, May 03 '20 at 08:04

score 3 · Answer 1 · answered May 03 '20 at 07:50

Generally i would return a Container() in this case.


return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        message != null
            ? Padding(
                padding: const EdgeInsets.all(24.0),
                child: Text(message),
              )
            : Container(), // how to omit second condition?
      ],
    );

Vinoth Vino · Accepted Answer · 2020-05-03T08:19:06.427

3

I prefer SizedBox instead of Container.

return Column(
  mainAxisAlignment: MainAxisAlignment.center,
  children: <Widget>[
    message != null
        ? Padding(
            padding: const EdgeInsets.all(24.0),
            child: Text(message),
          )
        : SizedBox(),
  ],
);

edited May 03 '20 at 08:19

answered May 03 '20 at 08:13

Vinoth Vino

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Just curious - what is the advantage of using sizedbox over container? – mahoriR May 03 '20 at 08:21
1

See this link bro https://stackoverflow.com/a/57703904/4608334 @Mahori – Vinoth Vino May 03 '20 at 08:23
1

I tend to agree with this option, also we can use const with SizedBox. – rozerro May 03 '20 at 08:52
1

@VinothVino thanks for the link. I will start using a sizedBox as well for placeholder! – mahoriR May 03 '20 at 09:04
Yeah, it's more efficient. Happy Coding... @Mahori – Vinoth Vino May 03 '20 at 09:19
1

Nice, +1 for using SizedBox :) – Midhun MP May 15 '20 at 16:27
Thanks. Happy Coding.. @MidhunMP – Vinoth Vino May 15 '20 at 17:15

How to omit second condition

2 Answers2