selectors

taming-the-state-in-react · Jun 4, 2017 · 3523734 · 3523734
1 parent 583015b
commit 3523734
Showing 1 changed file with 12 additions and 2 deletions.
diff --git a/src/index.js b/src/index.js
@@ -93,6 +93,16 @@ function doSetFilter(filter) {
   };
 }
 
+// selectors
+
+function getTodosAsIds(state) {
+  return state.todoState.ids;
+}
+
+function getTodo(state, todoId) {
+  return state.todoState.entities[todoId];
+}
+
 // store
 
 const rootReducer = combineReducers({
@@ -144,13 +154,13 @@ function TodoItem({ todo, onToggleTodo }) {
 
 function mapStateToPropsList(state) {
   return {
-    todosAsIds: state.todoState.ids,
+    todosAsIds: getTodosAsIds(state),
   };
 }
 
 function mapStateToPropsItem(state, props) {
   return {
-     todo: state.todoState.entities[props.todoId],
+     todo: getTodo(state, props.todoId),
   };
 }