Stateful vs Stateless Composables
Separate logic from presentation.
Stateful vs Stateless Composables is a free Jetpack Compose Academy lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Jetpack Compose Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Two Kinds of Composables
Every Composable is either stateful (it holds its own data) or stateless (it just renders what you pass in). Knowing which is which shapes your whole app.
What Stateful Means
A stateful Composable remembers something across recompositions, usually with remember. It owns and changes its own data.
fun Counter() {
var count by remember { mutableStateOf(0) }
Button(onClick = { count++ }) { Text("Count: " + count) }
}What Stateless Means
A stateless Composable holds no state of its own. It only reads its parameters and draws, so the same inputs always give the same output. 🎯
fun CounterDisplay(count: Int) {
Text("Count: " + count)
}Why Stateless Wins
Stateless Composables are easier to reuse: they fit any screen, in any state, because the caller decides what to show.
Easier to Preview
Because a stateless Composable just takes parameters, you can feed it sample data in @Preview and see every variation instantly.
@Preview
fun PreviewDisplay() {
CounterDisplay(count = 42)
}Easier to Test
Stateless parts are predictable: pass an input, assert the output. No hidden internal data means far simpler tests. ✅
The Trade-Off
Stateful Composables are convenient for quick demos, but they trap data inside. That makes them hard to share, preview, or control from outside.
Spotting the Difference
See a remember or mutableStateOf inside? It is stateful. See only parameters being read? It is stateless.
Separate Logic from Looks
A clean pattern: keep one thin stateful wrapper that owns data, and a stateless Composable that only handles how things look.
Composing the Two
The stateful wrapper feeds its data into the stateless one. Now the visual part stays pure while the state lives in just one place.
fun CounterScreen() {
var count by remember { mutableStateOf(0) }
CounterDisplay(count = count)
}A Mindset for Reuse
Default to stateless when you build components. Add state only at the spot that truly needs to own it, and no lower.
Quick Check
Which kind of Composable is the easiest to reuse and preview?
Recap
Stateful Composables own data; stateless ones just render parameters. Favor stateless components and keep state in one small wrapper. 🚀
Frequently asked questions
Is the “Stateful vs Stateless Composables” lesson free?
Yes — the full text of “Stateful vs Stateless Composables” is free to read here on the web, and the Jetpack Compose Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Jetpack Compose Academy course, upgrade to CoddyKit PRO.
What will I learn in “Stateful vs Stateless Composables”?
Separate logic from presentation. You practise Jetpack Compose Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Jetpack Compose Academy?
No prior experience is required. Jetpack Compose Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Stateful vs Stateless Composables” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Jetpack Compose Academy lesson?
Yes. Every Jetpack Compose Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Stateful vs Stateless Composables
- Hoist State with value & onValueChange
- Single Source of Truth
- Compose State Slots & Content Lambdas