javascript - 如何使用多个分隔符将字符串减少为自定义对象，Uncaught( promise ): TypeError: Cannot read property of undefined

Question

我有一个以下格式的字符串...

“6:00AM - 起床，整理床铺，刷牙。6:45AM - 洗澡。7:15AM - 吃早餐，去上学。”

我想根据句点、逗号和破折号来减少该字符串。基本上通过时间和事件获得一个物体。该对象应该看起来像这样...

{
  6:00AM: ['Get up', 'Make the bed', 'Brush my teeth'],
  6:45AM: ['Take a shower'],
  7:15AM: ['Have breakfast', 'Leave for school']
}

我该如何去做呢？我不太明白。

以下内容是我添加的内容。

现在，我有一个来自数据库的对象，如下所示......

[
  {
    "id": 1,
    "day": "Monday",
    "activities": "6:00AM - Get up, Make the bed, Brush my teeth. 6:45AM - Take a shower. 7:15AM - Have breakfast, Leave for school."
  },
  {
    "id": 2,
    "day": "Tuesday",
    "activities": "6:00AM - Get up, Make the bed, Brush my teeth. 6:45AM - Take a shower. 7:15AM - Have breakfast, Leave for school."
  }
]

我想循环该数组并用转换后的字符串(即返回的对象)替换每个 activities 属性的值。因此，我创建了一个名为 activities 的单独变量，并将其实例化为一个数组，我希望在其中存储从转换事件 property 返回的对象。所以..

let activities = [];

/* My function */ 
private splitter() {
  const activities = this.itinerary.map(item => {
    return item.activities;
  });

  const results = {};
  const res = activities.map(str => {
    for (const result of str.split('.').map(x => x.trim())) {
      if (result) {
        const [time, actions] = result.split(' - ');
        results[time] = actions.split(',').map(x => x.trim());
      }
    }
    return results;
  });
  return res;
}

我希望实现这样的目标......

[
    {
      6:00AM: ['Get up', 'Make the bed', 'Brush my teeth'],
      6:45AM: ['Take a shower'],
      7:15AM: ['Have breakfast', 'Leave for school']
    },
    {
      6:00AM: ['Get up', 'Make the bed', 'Brush my teeth'],
      6:45AM: ['Take a shower'],
      7:15AM: ['Have breakfast', 'Leave for school']
    }
]

但是，我收到错误...

Uncaught (in promise): TypeError: Cannot create property '6:00AM' on string '6:00AM - Get up, Make the bed, Brush my teeth.'

我怎样才能让它发挥作用？

Answer 1

这将只使用应在任何最新版本的 Node.JS 中运行的内置 JavaScript 来完成此任务:

const str = "6:00AM - Get up, Make the bed, Brush my teeth. 6:45AM - Take a shower. 7:15AM - Have breakfast, Leave for school."

sentences = {};
// split the string on periods, and trim each sentence
for (sentence of str.split('.').map(x => x.trim())) {
    // you end up with a completely empty sentence when the last
    // sentence ends in a period, which is uninteresting
    if (sentence) {
        // split each sentence on a hyphen, and assume the first
        // element is time and the second is actions
        let [time, actions] = sentence.split(' - ');

        // split the actions string on commas and trim whitespace;
        // store that in our sentences object
        sentences[time] = actions.split(',').map(x => x.trim());
    }
}

最后的 console.log(sentences) 给出:

{ '6:00AM': [ 'Get up', 'Make the bed', 'Brush my teeth' ],
  '6:45AM': [ 'Take a shower' ],
  '7:15AM': [ 'Have breakfast', 'Leave for school' ] }