Question

我有一组像这样的对象：

var a = [

  {
    "ClientSideAction": 1,
    "CompletedDate": "not null",
    "ItemDescription": "Step 1"
  },
  {
    "ClientSideAction": 1,
    "CompletedDate": null,
    "ItemDescription": "step 2"
  },
  {
    "ClientSideAction": 1,
    "CompletedDate": "not null",
    "ItemDescription": "Step 3"
  },
  {
    "ClientSideAction": 1,
    "CompletedDate": null,
    "ItemDescription": "step 4"
  }

];

如何删除CompletedDate == null？

中的元素

我已经尝试了._dropWhile，但是只要函数返回falsey就会停止，这不是我想要的。我想遍历所有对象并删除那些符合该条件的对象。现在，我知道我可以使用常规的js，但是如果可能的话我想使用lodash。我是Lodash的初学者，我想要变得更好。

这是我用过的.dropWhile：

var a2 = _.dropWhile(a, function(o) { return o.CompletedDate == null; });

Answer 1

您可以使用原生Array.filter()来过滤项目。

var a = [
  {
    "ClientSideAction": 1,
    "CompletedDate": "not null",
    "ItemDescription": "Step 1"
  },
  {
    "ClientSideAction": 1,
    "CompletedDate": null,
    "ItemDescription": "step 4"
  }
];

var b = a.filter(function(item) {
  return item.CompletedDate !== null;
});

console.log(b);

使用箭头功能可以在现代浏览器或nodejs中进一步简化：

var b = filter((x => x.CompletedDate !== null);

Answer 2

不需要lodash只过滤

var res = a.filter(x => x.CompletedDate !== null);

Answer 3

您可以使用Array.Filter

var a = [

  {
    "ClientSideAction": 1,
    "CompletedDate": "not null",
    "ItemDescription": "Step 1"
  },
  {
    "ClientSideAction": 1,
    "CompletedDate": null,
    "ItemDescription": "step 2"
  },
  {
    "ClientSideAction": 1,
    "CompletedDate": "not null",
    "ItemDescription": "Step 3"
  },
  {
    "ClientSideAction": 1,
    "CompletedDate": null,
    "ItemDescription": "step 4"
  }
];

var a = a.filter(function(v) {
  return v.CompletedDate != null;
})

console.log(a)

如何从属性等于空的数组中删除对象 - Lodash

3 个答案: