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Is it just me or the syntax here resembles that of Flutter's Dart

The syntax is definitely Go :)

The approach is a hybrid. The declarative approach with reconcilation (tree diffing) comes from React. The automatic layout with constraints does come from Flutter.

I understand it's Go. Just never thought that Go can also be written that way.

I personally like that kind of syntax for UI development.

And Flutter's Dart resembles Groovy's SwingBuilder:

https://groovy-lang.org/swing.html

Really, most of the stuff people think it is new in Flutter, it really isn't.

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