using the new keyword in flutter

Question

Recently started following the flutter udacity course and while experimenting with creating basic apps I came across something that was unclear to me. When adding widgets, I have noted that doing both new Widget() and Widget() [where Widget is any widget being added to the tree] give the same result. Is there a specific time when you should use new Widget() and a time when you should omit the new keyword?

For example:

return MaterialApp(
  debugShowCheckedModeBanner: false,
  home: new Scaffold(
    appBar: new AppBar(
      title: Text('My app name')
  ),
)

Text('My app name') works, but new Text('My app name') also works. Any chance I could get some pointers and guidelines on best practices with this?

score 87 · Accepted Answer · edited May 08 '19 at 12:41

87

new was made optional beginning with Dart 2.0, this is why some examples or tutorial still use new and newer or updated ones don't.

You can just always omit it.

const can be omitted when the context requires const

edited May 08 '19 at 12:41

CopsOnRoad

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answered Jun 03 '18 at 16:26

Günter Zöchbauer

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Ah, thanks for the clarification. Glad to know nothing will break – AJ254 Jun 03 '18 at 16:33
1

Duplicate by the way. – creativecreatorormaybenot Jun 03 '18 at 18:09
Didn't know it was not flutter specific @creativecreatorormaybenot, appreciate the clarification – AJ254 Jun 03 '18 at 18:26
1

No prob. This is what the deduplication feature is for. – Günter Zöchbauer Jun 03 '18 at 18:27

using the new keyword in flutter

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