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Jetpack-Compose-Playground/docs/general/compose_lifecycle.md

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+<!---
+This is the API of version 1.2.0
+-->
+# Lifecycle
+
+    
+Compose has some "effects"-functions that can be used in Composables to track the lifecycle of a function.
+
+* LaunchedEffect {}
+will be called the first time a compose function is applied.
+
+* DisposableEffect { }
+Has a onDispose() which will be called when the compose function isn't part of the composition anymore.
+
+The example below has a Button that will count up everytime it gets clicked.
+When the count value gets 3, the Text() function will not be added anymore.
+
+The first time the LifecycleDemo will be executed, the SideEffect in the if-clause will be executed.
+When the count value gets 3 +onDispose{} inside the if-clause will be called. 
+
+
+```kotlin
+@Composable
+fun LifecycleDemo() {
+    val count = remember { mutableStateOf(0) }
+
+    Column {
+        Button(onClick = {
+            count.value++
+        }) {
+            Text("Click me")
+        }
+
+        if (count.value < 3) {
+            LaunchedEffect(Unit)
+                Log.d("Compose", "onactive with value: " + count.value)
+            }
+            DisposableEffect(Unit) {
+                onDispose {
+                    Log.d("Compose", "onDispose because value=" + count.value)
+                }
+            }
+
+            Text(text = "You have clicked the button: " + count.value.toString())
+        }
+    }
+}
+```
+
+
+## See also:
+* [Full Example Code]({{ site.samplefolder }}/general/LifecycleDemo.kt)
+