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A side-effect in Compose is a change to the state of the app that happens outside the scope of a composable function. For example, opening a new screen when the user taps on a button, or showing a message when the app doesn't have Internet connection.

Recomposition is typically triggered by a change to a State<T> object. Compose tracks these and runs all composables in the Composition that read that particular State<T> , and any composables that they call that cannot be skipped.

The three basic standard layout elements in Compose are Column , Row and Box . They are Composable functions that take Composable content, so you can place items inside. For example, each child inside of a Column will be placed vertically.

LaunchedEffect is a side effect that allows you to launch a coroutine in response to a composition. It is similar to the standard launch function in Kotlin coroutines, but it is designed specifically for use in Jetpack Compose. LaunchedEffect is a suspending function that takes a lambda as its parameter.

remember can be used to store both mutable and immutable objects. Note: remember stores objects in the Composition, and forgets the object when the composable that called remember is removed from the Composition.

SideEffect is used to publish compose state to non-compose code. The SideEffect is triggered on every recomposition and it is not a coroutine scope, so suspend functions cannot be used within it.

both enters recomposition when conditions are true but LaunchedEffect is only invoked once because its key is Unit . SideEffect is invoked on each recomposition as long as condition is true. Recomposition starts whenever Compose thinks that the parameters of a composable might have changed.