javascript - 双过滤器在 JSON 数组中不起作用

Question

我在过滤 JSON 数组时遇到了一些问题。这是我想要的代码和结果，所以请帮我过滤一下。

var all = [
  {
    data : "test1",
    dataArray : [
      {
        name : "abc",
        status : true,
        address: "test"
      }, {
        name : "xyz",
        status : false,
        address: "test"
      }, {
        name : "pqr",
        status : true,
        address: "test"
      },
    ]
  },
  {
    data : "test2",
    dataArray : [
      {
        name : "abc",
        status : true,
        address: "test"
      }, {
        name : "xyz",
        status : false,
        address: "test"
      }, {
        name : "pqr",
        status : false,
        address: "test"
      },
    ]
  },
  {
    data : "test3",
    dataArray : [
      {
        name : "abc",
        status : false,
      }, {
        name : "xyz",
        status : false,
      }, {
        name : "pqr",
        status : true,
      },
    ]
  }
]

console.log(JSON.stringify(all.filter((a)=>a.dataArray.filter((b)=>b.status==true)),null,2));

想要这样的结果:
只有状态为 true 的数据，但我不知道为什么过滤器返回所有 JSON 数据。嵌套过滤器有什么问题吗？？

a = [
    {
      data : "test1",
      dataArray : [
        {
          status : true,
          address: "test"
        },{
          status : true,
          address: "test"
        },
      ]
    },
    {
      data : "test2",
      dataArray : [
        {
          status : true,
          address: "test"
        },
      ]
    },
    {
      data : "test3",
      dataArray : [
        {
            status : true,
            address: "test"
        }, {
            status : true,
            address: "test"
        }
      ]
    }
  ]

我使用了嵌套过滤器，但它不起作用。我怎样才能得到结果？

Answer 1

您需要将filter应用于dataArray，而不是all

all.forEach( s => s.dataArray = s.dataArray.filter( t => t.status ) )

注意事项

• 此解决方案会改变 all 数组，因此如果您不想改变 - 首先创建 all 的深拷贝。

演示

var all = [{
    data: "test1",
    dataArray: [{
      name: "abc",
      status: true,
      address: "test"
    }, {
      name: "xyz",
      status: false,
      address: "test"
    }, {
      name: "pqr",
      status: true,
      address: "test"
    }, ]
  },
  {
    data: "test2",
    dataArray: [{
      name: "abc",
      status: true,
      address: "test"
    }, {
      name: "xyz",
      status: false,
      address: "test"
    }, {
      name: "pqr",
      status: false,
      address: "test"
    }, ]
  },
  {
    data: "test3",
    dataArray: [{
      name: "abc",
      status: false,
    }, {
      name: "xyz",
      status: false,
    }, {
      name: "pqr",
      status: true,
    }, ]
  }
];

all.forEach(s => s.dataArray = s.dataArray.filter(t => t.status))

console.log(all);