angular - 如何使用 Angular Pipe 减少数组中对象的元素

Question

我的清单如下：

[{"center":"LFEEAPP","cause":"S ","total":66},{"center":"LFFFAD","cause":"S","total":78},{"center":"LFMMAPP","cause":"C","total":143},{"center":"LFMMAPP","cause":"T","total":0}]

现在，我想用reduce方法添加中心的所有值，包括：'APP'和'AD'，并将标签更改为'APP'，所以对于这个列表示例，我创建的管道必须返回： APP：209（总计）和 LFFFAD：78

管道：

export class MergeCentresAppPipe implements PipeTransform {

  transform(listCount: ListCount[]): ListCount[] {
    const totalCenterApp = listCount
      .filter(count => count.center.includes('APP'))
      .map(count => count.total)
      .reduce((sum, current) => sum + current, 0);

    const centerApp: ListCount = {
      center: 'APP',
      cause: '',
      total: totalTimeCenterApp,
    };

    const centerMerged = listCount.filter(count => !count.center.includes('APP'));
    centreMerged.push(centerApp);

    return centerMerged;
  }
}

如何将“AD”字符串添加到过滤器以获取： APP：287（APP：209 + LFFFAD：78）谢谢您的帮助

Answer 1

export class MergeCentresAppPipe implements PipeTransform {

  transform(listCount: ListCount[]): ListCount[] {
    const totalCenterApp = listCount
      .filter(count => count.center.includes('APP') || count.center.includes('AD')))
      .map(count => count.total)
      .reduce((sum, current) => sum + current, 0);

    const centerApp: ListCount = {
      center: 'APP',
      cause: '',
      total: totalTimeCenterApp,
    };

    const centerMerged = listCount.filter(count => !count.center.includes('APP') && !count.center.includes('AD'));
    centreMerged.push(centerApp);

    return centerMerged;
  }
}