demo: useReducer

app/src/main/java/me/pavi2410/useCompose/app/screens/ExampleScreen.kt

@@ -10,12 +10,14 @@ sealed class ExampleScreen(
 ) {
     object Counter : ExampleScreen("counter", "Counter", { CounterExample() })
     object Context : ExampleScreen("context", "Context", { ContextExample() })
+    object Reducer : ExampleScreen("reducer", "Reducer", { ReducerExample() })
     object Network : ExampleScreen("network", "Network", { NetworkExample() })
 }
 
 val exampleScreens
     get() = listOf(
         ExampleScreen.Counter,
         ExampleScreen.Context,
+        ExampleScreen.Reducer,
         ExampleScreen.Network
     )

app/src/main/java/me/pavi2410/useCompose/app/screens/ReducerExample.kt

@@ -0,0 +1,37 @@
+package me.pavi2410.useCompose.app.screens
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.material.Button
+import androidx.compose.material.Text
+import androidx.compose.runtime.Composable
+import me.pavi2410.useCompose.react.useReducer
+
+data class MyState(val count: Int)
+data class MyAction(val type: String)
+
+val initialState = MyState(0)
+
+@Composable
+fun ReducerExample() {
+    Column {
+        val (state, dispatch) = useReducer<MyState, MyAction>(initialState) { state, action ->
+            when (action.type) {
+                "increment" -> state.copy(count = state.count + 1)
+                "decrement" -> state.copy(count = state.count - 1)
+                else -> throw Error()
+            }
+        }
+
+        Text("Count: ${state.count}")
+        Button(onClick = {
+            dispatch(MyAction("increment"))
+        }) {
+            Text("+")
+        }
+        Button(onClick = {
+            dispatch(MyAction("decrement"))
+        }) {
+            Text("-")
+        }
+    }
+}