Question

第一个是对象数组：

let objectArray = [{
    FullName: "Person1",
    PersonId: "id1"
  },
  {
    FullName: "Person2",
    PersonId: "id2"
  },
  {
    FullName: "Person3",
    PersonId: "id3"
  },
  {
    FullName: "Person4",
    PersonId: "id4"
  }
];

第二个是包含一些ID的字符串数组。

let idsArray= ["id1", "id2", "id3"];

我需要删除其ID包含在第二个数组中的第一个数组的对象。

预期结果：

firstArray = [{
  FullName: "Person4",
  PersonId: "id4"
}];

浏览Linqjs文档时，我发现Except()方法允许我使用第二个数组作为“过滤器”从第一个数组中删除元素。

要使用此方法，我需要从objectArray创建一个新数组，该数组仅包含其ID包含在idsArray上的元素以用作参数。

示例：

let filteredArray = Enumerable.From(objectArray).Except(theNewArray).ToArray();

要创建此新数组，我可以使用Where()中的方法Linqjs。

我的问题从这里开始，因为考虑到我要过滤的ID数组，我不知道如何创建这个新数组。

Answer 1

您可以使用filter()来过滤数组。使用new Set()创建一个设置对象。这将使检查PersonId是否存在变得更加容易。无需循环每个filter()

let objectArray = [
  {FullName: "Person1",PersonId: "id1"},
  {FullName: "Person2",PersonId: "id2"},
  {FullName: "Person3",PersonId: "id3"},
  {FullName: "Person4",PersonId: "id4"}
];

let idsArray = ["id1", "id2", "id3"];

let idsToRemove = new Set(idsArray);
let result = objectArray.filter(o => !idsToRemove.has(o.PersonId));

console.log(result);

另一种选择是使用includes()测试数组是否包含某个字符串。

let objectArray = [
  {FullName: "Person1",PersonId: "id1"},
  {FullName: "Person2",PersonId: "id2"},
  {FullName: "Person3",PersonId: "id3"},
  {FullName: "Person4",PersonId: "id4"}
];

let idsArray = ["id1", "id2", "id3"];

let result = objectArray.filter(o => !idsArray.includes(o.PersonId));

console.log(result);

注意：如果您不想使用新变量，则可以覆盖现有变量，如下所示：

objectArray = objectArray.filter(o => ...);

Answer 2

您可以像下面这样使用Vanilla JavaScript的array.filter和array.includes：

let objectArray = [
  {FullName: "Person1", PersonId: "id1"},
  {FullName: "Person2", PersonId: "id2"},
  {FullName: "Person3", PersonId: "id3"},
  {FullName: "Person4", PersonId: "id4"}
];
    
  let excludeIdsArray= ["id1", "id2", "id3"];
  
  let newObj = objectArray.filter(obj => !excludeIdsArray.includes(obj.PersonId))
  
  console.log(newObj)

或者，您可以像这样使用array.reduce和array.includes：

let objectArray = [
  {FullName: "Person1", PersonId: "id1"},
  {FullName: "Person2", PersonId: "id2"},
  {FullName: "Person3", PersonId: "id3"},
  {FullName: "Person4", PersonId: "id4"}
];
        
let excludeIdsArray= ["id1", "id2", "id3"];

let newObj = objectArray.reduce((arr, myObject) => {
  if(!excludeIdsArray.includes(myObject.PersonId)) {
    arr.push(myObject)
  } 
  return arr
}, [])
  

console.log(newObj)

Answer 3

您可以结合使用string commandName = e.CommandName.ToString().Trim(); GridViewRow row = gvRestaurant.Rows[Convert.ToInt32(e.CommandArgument)]; switch (commandName) { case "ViewMore": List<Restaurant> restaurants = RestaurantDB.getRestaurantByCountry(Session["countryName"].ToString()); Restaurant r = restaurants[gvRestaurant.SelectedIndex]; Session["menuItems"] = r; Session["menu"] = r.Name; Response.Redirect("GetMenuItem.aspx"); break; case "MakeReservation": List<Restaurant> rs = RestaurantDB.getRestaurantByUserSelected(Session["countryName"].ToString(), Session["menu"].ToString()); Restaurant r1 = rs[gvRestaurant.SelectedIndex]; Session["menu"] = r1.Name; Response.Redirect("MakeReservation.aspx"); break; default: break;方法和Array.prototype.filter来测试是否在要排除的ID数组中找到indexOf属性-如果找不到，请将其添加到新的{ {1}}。参见以下示例：

PersonId

这是使用原始JavaScript实现的。如果这是您唯一要使用的，我建议您从项目的代码库中删除linqjs。

Answer 4

您可以将Except中的linq.js与对象数组和列参数一起使用，以排除不需要的PersonId。

var objectArray = [{ FullName: "Person1", PersonId: "id1" }, { FullName: "Person2", PersonId: "id2" }, { FullName: "Person3", PersonId: "id3" }, { FullName: "Person4", PersonId: "id4" }],
    idsArray = ["id1", "id2", "id3"],
    result = Enumerable
        .From(objectArray)
        .Except(
            Enumerable.From(idsArray).Select("{ PersonId: $ }"),
            "$.PersonId"
        )
        .ToArray();

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

<script src="https://cdnjs.cloudflare.com/ajax/libs/linq.js/2.2.0.2/linq.js"></script>

使用linqjs使用另一个数组中的值过滤一个数组

4 个答案: