如何过滤benefitGroups，仅保留含coverageLineIds=1的benefits的组？

我有一个名为benefitGroups的数组，每个元素包含benefits集合，每个benefit项都有coverageLineIds数组。需要过滤这个数组，只保留那些benefits中至少有一项的coverageLineIds包含ID 1的组。

代码示例 #

const benefitGroups = [
     {
      id: 1,
      name: "Benefit Group A",
      benefits: [
         {
         id: 1,
         benefitGroupId: 1,
         name: "Benefit Z",
         coverageLineIds: [1, 2]
         },
         {
         id: 2,
         benefitGroupId: 1,
         name: "Benefit X",
         coverageLineIds: [1, 2]
         },
         {
         id: 3,
         benefitGroupId: 1,
         name: "Benefit Y",
         coverageLineIds: [1, 2]
         },
      ],
    },
     {
      id: 2,
      name: "Benefit Group B",
      benefits: [
         {
         id: 4,
         benefitGroupId: 2,
         name: "Benefit I",
         coverageLineIds: [1]
         },
         {
         id: 5,
         benefitGroupId: 2,
         name: "Benefit J",
         coverageLineIds: [1]
         },
         {
         id: 6,
         benefitGroupId: 2,
         name: "Benefit H",
         coverageLineIds: [1]
         },
      ],
    },
     {
      id: 3,
      name: "Benefit Group C",
      benefits: [
         {
         id: 7,
         benefitGroupId: 3,
         name: "Benefit D",
         coverageLineIds: [3, 4]
         },
         {
         id: 8,
         benefitGroupId: 3,
         name: "Benefit E",
         coverageLineIds: [3, 4]
         },
         {
         id: 9,
         benefitGroupId: 3,
         name: "Benefit F",
         coverageLineIds: [3, 4]
         },
      ],
    },
];

解决方案 #

可以通过数组的filter()和some()方法组合实现，配合includes()检查ID是否存在：

const filteredGroups = benefitGroups.filter(group => 
  group.benefits.some(benefit => benefit.coverageLineIds.includes(1))
);

代码解释

• filter()：遍历benefitGroups数组，仅保留返回true的元素
• some()：检查当前组的benefits集合中，是否至少有一个benefit满足条件
• includes(1)：判断当前benefit的coverageLineIds数组中是否包含ID 1

结果说明 #

在示例代码中，filteredGroups会返回Benefit Group A和Benefit Group B——它们的benefits里都存在coverageLineIds包含1的项；而Benefit Group C的所有benefit的coverageLineIds都不含1，会被过滤掉。

内容的提问来源于stack exchange，提问作者noclist