Added exercises

step2-06/exercise/README.md

@@ -1,25 +1,17 @@
-# Step 2.6 - Redux: Dispatching actions and examining state (Exercise)
+# Step 2.6: Redux: React Binding (Exercise)
 
 [Lessons](../) | [Exercise](./exercise/) | [Demo](./demo/)
 
-## Visualize state changes with Chrome extension
+## Bind Redux Store with Class Component
 
-If you still have `npm test` running from the previous step, stop it with `ctrl+C`. Start the app by running `npm start` from the root of the `frontend-bootcamp` folder. Click the "exercise" link under day 2 step 6.
+1. Open `exercise/src/components/TodoHeader.tsx`.
 
-1. Install the [Redux DevTools extension](https://github.com/zalmoxisus/redux-devtools-extension)
-   - [Chrome](https://chrome.google.com/webstore/detail/redux-devtools/lmhkpmbekcpmknklioeibfkpmmfibljd)
-   - [Firefox](https://addons.mozilla.org/en-US/firefox/addon/reduxdevtools/)
+2. Just like the 2.4 exercise, implement `onAdd` and `onFilter` using `this.context.dispatch()` calls to dispatch actions.
 
-2. Hit F12 (`cmd+option+I` on Mac) and open the inspector panel entitled **Redux**
+## Bind Redux Store with Functional Component
 
-3. Modify `exercise/src/index.tsx` to dispatch actions (you're not limited to adding todos; you can also remove and clear)
+1. Open `exercise/src/components/TodoFooter.tsx`.
 
-4. Explore the actions' effects using the extension
+2. Follow the instructions in the file to replace the `todos` const using the `useMappedState()` hook.
 
-## Playing with dispatching actions inside tests
-
-Stop the app using `ctrl+C` and start the tests by running `npm test`.
-
-1. Open `exercise/src/reducers/reducer.spec.ts`
-
-2. Follow the instructions to fill out the reducer tests
+3. Retrieve the dispatch function with `useDispatch()` hook.

step2-06/exercise/src/actions/index.ts

@@ -1,5 +1,10 @@
 import uuid from 'uuid/v4';
 
 export const actions = {
-  addTodo: (label: string) => ({ type: 'addTodo', id: uuid(), label })
+  addTodo: (label: string) => ({ type: 'addTodo', id: uuid(), label }),
+  remove: (id: string) => ({ type: 'remove', id }),
+  complete: (id: string) => ({ type: 'complete', id }),
+  clear: () => ({ type: 'clear' }),
+  setFilter: (filter: string) => ({ type: 'setFilter', filter }),
+  edit: (id: string, label: string) => ({ type: 'edit', id, label })
 };

step2-06/exercise/src/components/TodoApp.tsx

@@ -0,0 +1,17 @@
+import React from 'react';
+import { Stack } from 'office-ui-fabric-react';
+import { TodoFooter } from './TodoFooter';
+import { TodoHeader } from './TodoHeader';
+import { TodoList } from './TodoList';
+
+export const TodoApp = () => {
+  return (
+    <Stack horizontalAlign="center">
+      <Stack style={{ width: 400 }} gap={25}>
+        <TodoHeader />
+        <TodoList />
+        <TodoFooter />
+      </Stack>
+    </Stack>
+  );
+};

step2-06/exercise/src/components/TodoFooter.tsx

@@ -0,0 +1,24 @@
+import React from 'react';
+import { DefaultButton, Stack, Text } from 'office-ui-fabric-react';
+import { actions } from '../actions';
+import { useMappedState, useDispatch } from 'redux-react-hook';
+
+export const TodoFooter = () => {
+  // TODO: make use of useMappedState(state => state) and the useDispatch functions to get
+  // the Redux store and dispatching actions
+  // HINT: const { todos } = useMappedState(...);
+  // HINT: useDispatch() here too.
+  const todos = {};
+  const dispatch = (...args: any[]) => {};
+
+  const itemCount = Object.keys(todos).filter(id => !todos[id].completed).length;
+
+  return (
+    <Stack horizontal horizontalAlign="space-between">
+      <Text>
+        {itemCount} item{itemCount === 1 ? '' : 's'} left
+      </Text>
+      <DefaultButton onClick={() => dispatch(actions.clear())}>Clear Completed</DefaultButton>
+    </Stack>
+  );
+};

step2-06/exercise/src/components/TodoHeader.tsx

@@ -0,0 +1,67 @@
+import React from 'react';
+import { Stack, Text, Pivot, PivotItem, TextField, PrimaryButton } from 'office-ui-fabric-react';
+import { FilterTypes } from '../store';
+import { actions } from '../actions';
+import { StoreContext } from 'redux-react-hook';
+
+interface TodoHeaderState {
+  labelInput: string;
+}
+
+export class TodoHeader extends React.Component<{}, TodoHeaderState> {
+  constructor(props: {}) {
+    super(props);
+    this.state = { labelInput: undefined };
+  }
+
+  render() {
+    return (
+      <Stack gap={10}>
+        <Stack horizontal horizontalAlign="center">
+          <Text variant="xxLarge">todos</Text>
+        </Stack>
+
+        <Stack horizontal gap={10}>
+          <Stack.Item grow>
+            <TextField
+              placeholder="What needs to be done?"
+              value={this.state.labelInput}
+              onChange={this.onChange}
+              styles={props => ({
+                ...(props.focused && {
+                  field: {
+                    backgroundColor: '#c7e0f4'
+                  }
+                })
+              })}
+            />
+          </Stack.Item>
+          <PrimaryButton onClick={this.onAdd}>Add</PrimaryButton>
+        </Stack>
+
+        <Pivot onLinkClick={this.onFilter}>
+          <PivotItem headerText="all" />
+          <PivotItem headerText="active" />
+          <PivotItem headerText="completed" />
+        </Pivot>
+      </Stack>
+    );
+  }
+
+  private onAdd = () => {
+    // TODO: Fill in a dispatch call to add the todo item
+    // HINT: this.context.dispatch(...);
+    this.setState({ labelInput: undefined });
+  };
+
+  private onChange = (evt: React.FormEvent<HTMLInputElement>, newValue: string) => {
+    this.setState({ labelInput: newValue });
+  };
+
+  private onFilter = (item: PivotItem) => {
+    // TODO: Fill in the dispatch call to set the filter
+    // HINT: this.context.dispatch(...);
+  };
+}
+
+// TODO: set the context type of this Class to StoreContext

step2-06/exercise/src/components/TodoList.tsx

@@ -0,0 +1,19 @@
+import React from 'react';
+import { Stack } from 'office-ui-fabric-react';
+import { TodoListItem } from './TodoListItem';
+import { useMappedState } from 'redux-react-hook';
+
+export const TodoList = () => {
+  const { filter, todos } = useMappedState(state => state);
+  const filteredTodos = Object.keys(todos).filter(id => {
+    return filter === 'all' || (filter === 'completed' && todos[id].completed) || (filter === 'active' && !todos[id].completed);
+  });
+
+  return (
+    <Stack gap={10}>
+      {filteredTodos.map(id => (
+        <TodoListItem key={id} id={id} />
+      ))}
+    </Stack>
+  );
+};

step2-06/exercise/src/components/TodoListItem.tsx

@@ -0,0 +1,78 @@
+import React from 'react';
+import { Stack, Checkbox, IconButton, TextField, DefaultButton } from 'office-ui-fabric-react';
+import { actions } from '../actions';
+import { StoreContext } from 'redux-react-hook';
+
+interface TodoListItemProps {
+  id: string;
+}
+
+interface TodoListItemState {
+  editing: boolean;
+  editLabel: string;
+}
+
+export class TodoListItem extends React.Component<TodoListItemProps, TodoListItemState> {
+  constructor(props: TodoListItemProps) {
+    super(props);
+    this.state = { editing: false, editLabel: undefined };
+  }
+
+  render() {
+    const { id } = this.props;
+    const { todos } = this.context.getState();
+    const dispatch = this.context.dispatch;
+
+    const item = todos[id];
+
+    return (
+      <Stack horizontal verticalAlign="center" horizontalAlign="space-between">
+        {!this.state.editing && (
+          <>
+            <Checkbox label={item.label} checked={item.completed} onChange={() => dispatch(actions.complete(id))} />
+            <div>
+              <IconButton iconProps={{ iconName: 'Edit' }} onClick={this.onEdit} />
+              <IconButton iconProps={{ iconName: 'Cancel' }} onClick={() => dispatch(actions.remove(id))} />
+            </div>
+          </>
+        )}
+
+        {this.state.editing && (
+          <Stack.Item grow>
+            <Stack horizontal gap={10}>
+              <Stack.Item grow>
+                <TextField value={this.state.editLabel} onChange={this.onChange} />
+              </Stack.Item>
+              <DefaultButton onClick={this.onDoneEdit}>Save</DefaultButton>
+            </Stack>
+          </Stack.Item>
+        )}
+      </Stack>
+    );
+  }
+
+  private onEdit = () => {
+    const { id } = this.props;
+    const { todos } = this.context.getState();
+    const { label } = todos[id];
+
+    this.setState({
+      editing: true,
+      editLabel: this.state.editLabel || label
+    });
+  };
+
+  private onDoneEdit = () => {
+    this.context.dispatch(actions.edit(this.props.id, this.state.editLabel));
+    this.setState({
+      editing: false,
+      editLabel: undefined
+    });
+  };
+
+  private onChange = (evt: React.FormEvent<HTMLInputElement>, newValue: string) => {
+    this.setState({ editLabel: newValue });
+  };
+}
+
+TodoListItem.contextType = StoreContext;

step2-06/exercise/src/index.tsx

@@ -1,16 +1,19 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
 import { reducer } from './reducers';
 import { createStore } from 'redux';
+import { TodoApp } from './components/TodoApp';
+import { initializeIcons } from '@uifabric/icons';
 import { composeWithDevTools } from 'redux-devtools-extension';
-import { actions } from './actions';
+import { StoreContext } from 'redux-react-hook';
 
 const store = createStore(reducer, {}, composeWithDevTools());
 
-console.log(store.getState());
+initializeIcons();
 
-// TODO: dispatch several actions and see the effects on state inside the Redux devtools
-
-// store.dispatch(actions.???);
-// store.dispatch(actions.???);
-// store.dispatch(actions.???);
-
-console.log(store.getState());
+ReactDOM.render(
+  <StoreContext.Provider value={store}>
+    <TodoApp />
+  </StoreContext.Provider>,
+  document.getElementById('app')
+);

step2-06/exercise/src/reducers/index.ts

@@ -1,27 +1,43 @@
 import { Store } from '../store';
-import { addTodo, remove, complete, clear } from './pureFunctions';
+import { combineReducers } from 'redux';
+import { createReducer } from 'redux-starter-kit';
 
-function todoReducer(state: Store['todos'] = {}, action: any): Store['todos'] {
-  switch (action.type) {
-    case 'addTodo':
-      return addTodo(state, action.id, action.label);
+export const todosReducer = createReducer<Store['todos']>(
+  {},
+  {
+    addTodo(state, action) {
+      state[action.id] = { label: action.label, completed: false };
+    },
 
-    case 'remove':
-      return remove(state, action.id);
+    remove(state, action) {
+      delete state[action.id];
+    },
 
-    case 'clear':
-      return clear(state);
+    clear(state, action) {
+      Object.keys(state).forEach(key => {
+        if (state[key].completed) {
+          delete state[key];
+        }
+      });
+    },
 
-    case 'complete':
-      return complete(state, action.id);
+    complete(state, action) {
+      state[action.id].completed = !state[action.id].completed;
+    },
+
+    edit(state, action) {
+      state[action.id].label = action.label;
+    }
   }
+);
 
-  return state;
-}
+export const filterReducer = createReducer<Store['filter']>('all', {
+  setFilter(state, action) {
+    return action.filter;
+  }
+});
 
-export function reducer(state: Store, action: any): Store {
-  return {
-    todos: todoReducer(state.todos, action),
-    filter: 'all'
-  };
-}
+export const reducer = combineReducers({
+  todos: todosReducer,
+  filter: filterReducer
+});

step2-06/exercise/src/reducers/pureFunctions.spec.ts

@@ -1,29 +0,0 @@
-import { addTodo, complete } from './pureFunctions';
-import { Store } from '../store';
-
-describe('TodoApp reducers', () => {
-  it('can add an item', () => {
-    const state = <Store['todos']>{};
-
-    const newState = addTodo(state, '0', 'item1');
-
-    const keys = Object.keys(newState);
-
-    expect(newState).not.toBe(state);
-    expect(keys.length).toBe(1);
-    expect(newState[keys[0]].label).toBe('item1');
-    expect(newState[keys[0]].completed).toBeFalsy();
-  });
-
-  it('can complete an item', () => {
-    const state = <Store['todos']>{};
-
-    let newState = addTodo(state, '0', 'item1');
-
-    const key = Object.keys(newState)[0];
-
-    newState = complete(newState, key);
-
-    expect(newState[key].completed).toBeTruthy();
-  });
-});

step2-06/exercise/src/reducers/pureFunctions.ts

@@ -1,35 +0,0 @@
-import { Store, FilterTypes } from '../store';
-
-export function addTodo(state: Store['todos'], id: string, label: string): Store['todos'] {
-  return { ...state, [id]: { label, completed: false } };
-}
-
-export function remove(state: Store['todos'], id: string) {
-  const newTodos = { ...state };
-
-  delete newTodos[id];
-
-  return newTodos;
-}
-
-export function complete(state: Store['todos'], id: string) {
-  // Clone the todo, overriding
-  const newTodo = { ...state[id], completed: !state[id].completed };
-  return { ...state, [id]: newTodo };
-}
-
-export function clear(state: Store['todos']) {
-  const newTodos = { ...state };
-
-  Object.keys(state).forEach(key => {
-    if (state[key].completed) {
-      delete newTodos[key];
-    }
-  });
-
-  return newTodos;
-}
-
-export function setFilter(state: Store['filter'], filter: FilterTypes) {
-  return filter;
-}

step2-06/exercise/src/reducers/reducer.spec.ts

@@ -1,19 +0,0 @@
-import { createStore } from 'redux';
-import { reducer } from '.';
-import { actions } from '../actions';
-
-describe('reducers', () => {
-  it('should add items', () => {
-    // 1. Use Redux's createStore() to create a store. Pass in a reducer along with the initial state.
-    //
-    // 2. Call store.dispatch() with some action messages to indicate the kind of
-    // action to perform (in this case, addTodo)
-    //
-    // 3. Assert with expect() on the resultant store.getState().todos
-  });
-
-  // Tests left for you to write:
-  // - remove
-  // - clear
-  // - complete
-});