freeCodeCamp/curriculum/challenges/chinese/03-front-end-libraries/redux/remove-an-item-from-an-array.chinese.md

id, title, challengeType, isRequired, forumTopicId, localeTitle

id	title	challengeType	isRequired	forumTopicId	localeTitle
5a24c314108439a4d403615a	Remove an Item from an Array	6	false	301447	从数组中删除项目

Description

是时候练习从数组中删除项目了。扩展运算符也可以在这里使用。其他有用的JavaScript方法包括slice()和concat()。

Instructions

reducer 和 action creator 被修改为根据项目的索引从数组中删除一个项目。完成编写 reducer 以便返回一个新的状态数组，并删除特定索引处的项目。

Tests

tests:
  - text: Redux store 应该存在并初始化一个<code>[0,1,2,3,4,5]</code>的状态。
    testString: assert((function() { const initialState = store.getState(); return (Array.isArray(initialState) === true && DeepEqual(initialState, [0, 1, 2, 3, 4, 5])); })());
  - text: <code>removeItem</code>和<code>immutableReducer</code>都应该是一个函数。
    testString: assert(typeof removeItem === 'function' && typeof immutableReducer === 'function');
  - text: dispatch <code>removeItem</code> action creator 应该从 state 中删除项目，不应该改变 state。
    testString: assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch(removeItem(3)); const state_1 = store.getState(); store.dispatch(removeItem(2)); const state_2 = store.getState(); store.dispatch(removeItem(0)); store.dispatch(removeItem(0)); store.dispatch(removeItem(0)); const state_3 = store.getState(); return isFrozen && DeepEqual(state_1, [0, 1, 2, 4, 5]) && DeepEqual(state_2, [0, 1, 4, 5]) && DeepEqual(state_3, [5]); })());

Challenge Seed

const immutableReducer = (state = [0,1,2,3,4,5], action) => {
  switch(action.type) {
    case 'REMOVE_ITEM':
      // 不要在这里改变 state 否则测试会失败。
      return
    default:
      return state;
  }
};

const removeItem = (index) => {
  return {
    type: 'REMOVE_ITEM',
    index
  }
}

const store = Redux.createStore(immutableReducer);

Solution

const immutableReducer = (state = [0,1,2,3,4,5], action) => {
  switch(action.type) {
    case 'REMOVE_ITEM':
      return [
        ...state.slice(0, action.index),
        ...state.slice(action.index + 1)
      ];
    default:
      return state;
  }
};

const removeItem = (index) => {
  return {
    type: 'REMOVE_ITEM',
    index
  }
}

const store = Redux.createStore(immutableReducer);