Flutter UIs are built with an imperative, object-oriented language (Dart, the same language used to build Flutter’s framework). Flutter doesn’t ship with a declarative markup.
We found that UIs dynamically built with code allow for more flexibility. For example, we have found it difficult for a rigid markup system to express and produce customized widgets with bespoke behaviors.
We have also found that our “code-first” better allows for features like hot reload and dynamic environment adaptations.
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