如何使用Lodash过滤嵌套数组？

Question

这是我的数组（http://www.jsoneditoronline.org/?id=cc51a12581667055781639b586fa6e15）：

[
  {
    "documents": [
      {
        "name": "a",
        "isSelected": true,
        "status": "good"
      },
      {
        "name": "b",
        "isSelected": false,
        "status": "good"
      }
    ]
  },
  {
    "documents": [
      {
        "name": "a",
        "isSelected": true,
        "status": "bad"
      },
      {
        "name": "b",
        "isSelected": false,
        "status": "good"
      }
    ]
  },
  {
    "documents": [
      {
        "name": "a",
        "isSelected": true,
        "status": "verygood"
      },
      {
        "name": "b",
        "isSelected": false,
        "status": "good"
      }
    ]
  },
  {
    "documents": [
      {
        "name": "a",
        "isSelected": false,
        "status": "good"
      },
      {
        "name": "b",
        "isSelected": false,
        "status": "good"
      }
    ]
  }
]

我需要使用_.lodash写条件。 如果数组中至少有一个Selected除Status或good之外的verygood或good

，则此条件必须返回TRUE

基于上面的数组。 http://prnt.sc/de3gx9 您可以在屏幕截图中看到数组中的对象是：

1. isSelected
2. 具有除verygood或 function checkStatusInArray() { var data = [....]; // this is my array var isDocumentSelectedWithWrongStatus = _.some(data, { isSelected: true, status: !"good" || !"verygood" }); // So if in array are some items with isSelected = true and status != good || verygood, then isDocumentSelectedWithWrongStatus = TRUE return isDocumentSelectedWithWrongStatus; }
之外的其他状态

如果在我的数组中至少有一个对象（isSelected = true，状态=坏（或者除了好或非常好）。 然后我想看结果： TRUE

{{1}}

Answer 1

你可以在Array#some内没有lodash - Array#some和谓词（谓词可以作为匿名函数内联），如果谓词返回，结果将是真实的：

function checkData(data, predicate) {
  return data.some(function(item) {
    return item.documents.some(predicate);
  });
}

function predicate(document) {
  return document.isSelected && 
    !(document.status === 'good' ||
    document.status === 'verygood');
}

＆＃13;

＆＃13;

function checkData(data, predicate) {
  return data.some(function(item) {
    return item.documents.some(predicate);
  });
}

function predicate(document) {
  return document.isSelected && 
    !(document.status === 'good' ||
    document.status === 'verygood');
}

var data = [{
  "documents": [{
    "name": "a",
    "isSelected": true,
    "status": "good"
  }, {
    "name": "b",
    "isSelected": false,
    "status": "good"
  }]
}, {
  "documents": [{
    "name": "a",
    "isSelected": true,
    "status": "bad"
  }, {
    "name": "b",
    "isSelected": false,
    "status": "good"
  }]
}, {
  "documents": [{
    "name": "a",
    "isSelected": true,
    "status": "verygood"
  }, {
    "name": "b",
    "isSelected": false,
    "status": "good"
  }]
}, {
  "documents": [{
    "name": "a",
    "isSelected": false,
    "status": "good"
  }, {
    "name": "b",
    "isSelected": false,
    "status": "good"
  }]
}];

var result = checkData(data, predicate);

console.log(result);

＆＃13;

＆＃13;

＆＃13;

Answer 2

您可以使用lodash的flatMap将文档整理到一个集合中，然后在集合中使用some：

＆＃13;

＆＃13;

var data = [{"documents":[{"name":"a","isSelected":true,"status":"good"},{"name":"b","isSelected":false,"status":"good"}]},{"documents":[{"name":"a","isSelected":true,"status":"bad"},{"name":"b","isSelected":false,"status":"good"}]},{"documents":[{"name":"a","isSelected":true,"status":"verygood"},{"name":"b","isSelected":false,"status":"good"}]},{"documents":[{"name":"a","isSelected":false,"status":"good"},{"name":"b","isSelected":false,"status":"good"}]}]

var selectedButNotGood = function(document){
  return document.isSelected && 
    document.status != "good" && 
    document.status != "verygood"
}

var result = _.chain(data)
              .flatMap('documents')
              .some(selectedButNotGood)
              .value();

console.log(result)

＆＃13;

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.2/lodash.min.js"></script>

＆＃13;

＆＃13;

＆＃13;

Answer 3

您可以循环遍历它们并创建自己的自定义数组。

var d = [{"documents":[{"name":"a","isSelected":true,"status":"good"},{"name":"b","isSelected":false,"status":"good"}]},{"documents":[{"name":"a","isSelected":true,"status":"bad"},{"name":"b","isSelected":false,"status":"good"}]},{"documents":[{"name":"a","isSelected":true,"status":"verygood"},{"name":"b","isSelected":false,"status":"good"}]},{"documents":[{"name":"a","isSelected":false,"status":"good"},{"name":"b","isSelected":false,"status":"good"}]}]

var statusList = ['good', 'verygood']
var r = d.some(function(o) {
  return o.documents.filter(x => !statusList.includes(x.status) && x.isSelected).length > 0;
});
console.log(r)