0

我有一个这样的对象数组

events = [ {
    'summary': 'sample test events1',
    'location': 'coimbatore',
    'start': {
        'date': '2018-08-28',
        'timeZone': 'America/Los_Angeles'
    },
    'end': {
        'date': '2018-08-28',
        'timeZone': 'America/Los_Angeles'
    }
    },
    {
      'summary': 'sample test events2',
      'location': 'coimbatore',
      'start': {
          'date': '2018-08-29',
          'timeZone': 'America/Los_Angeles'
      },
      'end': {
          'date': '2018-08-29',
          'timeZone': 'America/Los_Angeles'
      }
    },
    {
    'summary': 'sample test events4',
    'location': 'coimbatore',
    'start': {
        'date': '2018-08-27',
        'timeZone': 'America/Los_Angeles'
    },
    'end': {
        'date': '2018-08-27',
        'timeZone': 'America/Los_Angeles'
    }
    },
    {
      'summary': 'sample test events5',
      'location': 'coimbatore',
      'start': {
          'date': '2018-08-26',
          'timeZone': 'America/Los_Angeles'
      },
      'end': {
          'date': '2018-08-26',
          'timeZone': 'America/Los_Angeles'
      }
      }];

我有另一个要过滤的对象数组

toFilterEvents = [
{startDate: "2018-08-28", summary: "sample test events1"},
{startDate: "2018-08-29", summary: "sample test events2"},
]

我希望结果是这样的，

events = [ 

    {
    'summary': 'sample test events4',
    'location': 'coimbatore',
    'start': {
        'date': '2018-08-27',
        'timeZone': 'America/Los_Angeles'
    },
    'end': {
        'date': '2018-08-27',
        'timeZone': 'America/Los_Angeles'
    }
    },
    {
      'summary': 'sample test events5',
      'location': 'coimbatore',
      'start': {
          'date': '2018-08-26',
          'timeZone': 'America/Los_Angeles'
      },
      'end': {
          'date': '2018-08-26',
          'timeZone': 'America/Los_Angeles'
      }
      }];

我尝试过的，

filterExistingEvents(toFilterEvents);

filterExistingEvents(filtered_events) {
    const hello = this.events.filter((r, i) => {
      return filtered_events.some(f => r.summary !== f.summary)
    });
    console.log('events after filter', hello, this.events);  
}

如您所见，我正在使用过滤器和一些来获得所需的输出，如上所示，但它不起作用。我发现了类似的问题，但这是在没有 toFilterEvents 的情况下返回事件

4

2 回答 2

2

Array.prototype.sometrue如果至少一个数组元素与条件匹配，则 返回如果所有数组元素都与条件匹配，则Array.prototype.every返回true

filterExistingEvents(filtered_events) {
    const hello = this.events.filter((r, i) => {
      return filtered_events.every(f => r.summary !== f.summary)
    });
    console.log('events after filter', hello, this.events);  
}
于 2018-05-31T15:09:04.387 回答
0

看起来您想过滤多个字段，因此最好从高阶函数创建过滤器函数，可以在此处找到详细示例。

我认为你实际上是在寻找一些而不是每一个的反转。

const events = [{
  'summary': 'sample test events1',
  'location': 'coimbatore',
  'start': {
    'date': '2018-08-28',
    'timeZone': 'America/Los_Angeles'
  },
  'end': {
    'date': '2018-08-28',
    'timeZone': 'America/Los_Angeles'
  }
},
{
  'summary': 'sample test events2',
  'location': 'coimbatore',
  'start': {
    'date': '2018-08-29',
    'timeZone': 'America/Los_Angeles'
  },
  'end': {
    'date': '2018-08-29',
    'timeZone': 'America/Los_Angeles'
  }
},
{
  'summary': 'sample test events4',
  'location': 'coimbatore',
  'start': {
    'date': '2018-08-27',
    'timeZone': 'America/Los_Angeles'
  },
  'end': {
    'date': '2018-08-27',
    'timeZone': 'America/Los_Angeles'
  }
},
{
  'summary': 'sample test events5',
  'location': 'coimbatore',
  'start': {
    'date': '2018-08-26',
    'timeZone': 'America/Los_Angeles'
  },
  'end': {
    'date': '2018-08-26',
    'timeZone': 'America/Los_Angeles'
  }
}];

const filterFn = getter => comparer => o =>
  comparer(getter(o))
;
const isNotIn = hayStack => needle =>
  !hayStack.some(x=>x===needle)
;
const summary = o => o.summary;
const startDate = o => o.start.date;
const toFilterEvents = [
  { startDate: "2018-08-28", summary: "sample test events1" },
  { startDate: "2018-08-29", summary: "sample test events2" },
];
//filter out any events that have summary or startDate in toFilterEvents
console.log(
  events.filter(
    filterFn(summary)(isNotIn(toFilterEvents.map(x=>x.summary)))
  ).filter(
    filterFn(startDate)(isNotIn(toFilterEvents.map(x=>x.startDate)))
  ).map(x=>x.summary)
);
//filter out any events that have summary and startDate in toFilterEvents
console.log(
  events.filter(
    (
      (summaries,startDates)=>item=>
        filterFn(summary)(isNotIn(summaries))(item) ||
        filterFn(startDate)(isNotIn(startDates))(item)
    )(toFilterEvents.map(x=>x.summary),toFilterEvents.map(x=>x.startDate))
  ).map(x=>x.summary)
);

于 2018-05-31T15:53:42.927 回答