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。 这种情况必须返回TRUE，如果阵列中至少一个Selected与文档Status比其他的good或verygood

---

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. 具有比其他状态good或verygood

如果在我的Array中至少有一个对象（isSelected = true，status = bad（或者除了good或verygood之外的任何其他）。那么我想看到RESULT： TRUE

 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; 
    }

Answer 1

你可以在没有lodash的情况下完成 - Array#some在Array#some和一个谓词（谓词可以内联为匿名函数），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');
}

 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); 

Answer 2

您可以使用lodash的flatMap将文档打包到一个集合中，然后在集合中使用一些 ：

 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) 

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

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)