質問編集履歴
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エラー発生タイミングの追加、行弁号の削除
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現在reactの学習をしています。
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作成したTodoアプリにreact-reduxを導入しようとしたところ、発生したTypeErrorが解決できず困って
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作成したTodoアプリにreact-reduxを導入しようとしたところ、発生したTypeErrorが解決できず困っております。
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### 発生している問題・エラーメッセージ
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エラー発生のタイミングは初期表示時です。
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```
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import React from 'react';
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export default function TodoApp({ task, tasks, inputTask, addTask }) {
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return (
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<div>
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<input type="text" onChange={(e) => inputTask(e.target.value)} />
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<input type="button" value="add" onClick={() => addTask(task)} />
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<ul>
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{
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tasks.map(function(item, i) {
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return (
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<li key={i}>{item}</li>
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);
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})
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}
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</ul>
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</div>
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}
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```
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```javascript
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import { connect } from 'react-redux';
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import TodoApp from '../components/TodoApp';
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import { inputTask, addTask } from '../actions/tasks';
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function mapStateToProps({ task, tasks }) {
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return {
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task,
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tasks
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};
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}
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function mapDispatchToProps(dispatch) {
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return {
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addTask(task) {
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dispatch(addTask(task));
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},
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inputTask(task) {
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dispatch(inputTask(task))
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}
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};
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}
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export default connect(mapStateToProps, mapDispatchToProps)(TodoApp);
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```
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```javascript
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import React from 'react';
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import { Provider } from 'react-redux';
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import { createStore } from 'redux';
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import { render } from 'react-dom';
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import tasksReducer from './reducers/tasks';
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import TodoApp from './components/TodoApp';
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const store = createStore(tasksReducer);
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render(
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<Provider store={store}>
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<TodoApp />
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</Provider>,
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document.getElementById('root')
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);
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```
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```javascript
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const initialState = {
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task: '',
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tasks: [ ]
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};
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export default function tasksReducer(state = initialState, action) {
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switch(action.type) {
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case 'INPUT_TASK':
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return {
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...state,
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task: action.payload.task
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};
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case 'ADD_TASK':
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return {
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...state,
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tasks: state.tasks.concat([action.payload.task])
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};
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default:
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return state;
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}
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}
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```
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```javascript
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export const inputTask = (task) => ({
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type: 'INPUT_TASK',
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payload: {
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task
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}
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});
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export const addTask = (task) => ({
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type: 'ADD_TASK',
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payload: {
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task
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}
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});
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```
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@@ -245,3 +247,7 @@
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②tasksが正しく渡されていないのが原因と考え、mapStateToPropsを確認し、returnのカッコを()から{}に修正
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③state.tasksの初期設定にからの配列が入れられていることを確認
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1
src/reducers/tasks.jsとsrc/actions/tasks.jsの追加
test
CHANGED
File without changes
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test
CHANGED
@@ -154,6 +154,86 @@
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```javascript
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1 const initialState = {
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2 task: '',
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3 tasks: [ ]
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4 };
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6 export default function tasksReducer(state = initialState, action) {
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7 switch(action.type) {
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8 case 'INPUT_TASK':
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9 return {
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10 ...state,
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11 task: action.payload.task
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12 };
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13 case 'ADD_TASK':
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14 return {
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15 ...state,
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16 tasks: state.tasks.concat([action.payload.task])
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17 };
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18 default:
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19 return state;
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20 }
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21 }
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```
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```javascript
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1 export const inputTask = (task) => ({
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2 type: 'INPUT_TASK',
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3 payload: {
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4 task
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5 }
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6 });
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8 export const addTask = (task) => ({
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9 type: 'ADD_TASK',
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10 payload: {
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11 task
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12 }
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13 });
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```
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### 試したこと
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