React → Flutter: Mental Model

Flutter is not a foreign country — it’s a familiar city with different street names. Your React instincts about declarative UI, component composition, props-down/events-up, and state driving renders are all valid in Flutter. What changes is the syntax layer and a handful of framework conventions. This module maps those shifts explicitly so you spend zero time re-learning fundamentals and jump straight to being productive.

The six shifts

Lesson	The shift
Everything is a Widget	Layout/spacing/styling are widgets, not CSS
Declarative UI	Same idea (UI = f(state)) — different reconciler
No JSX	Dart constructors instead of angle-bracket tags
Composition	Wrapping widgets instead of wrapping components
Same vs Different	The explicit lookup table for your muscle memory

What is the single most important mental shift when moving from React to Flutter?

Learning a new programming language Understanding that layout, spacing, and styling are all widgets — there is no CSS Switching from functional to class-based programming Understanding the Dart type system

Which core React concept maps DIRECTLY onto Flutter with almost no change?

JSX templates CSS-in-JS styling Declarative UI (UI = f(state)) The virtual DOM

In Flutter, how do you apply padding to a widget?

Add a style={{ padding: 16 }} attribute Wrap the widget in a Padding widget Call .setPadding() on the widget Use a CSS class

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