Lodash通过匹配ids数组从数组中删除对象

I have an array of objects like:

我有一个对象数组,如:

var a = [
  {id: 1, name: 'A'},
  {id: 2, name: 'B'},
  {id: 3,  name: 'C'},
  {id: 4, name: 'D'}
];

And Ids array which i want to remove from array a :

和Ids数组,我想从数组中删除a:

var removeItem = [1,2];

I want to remove objects from array a by matching its ids, which removeItem array contains. How can i implement with lodash.

我想通过匹配其removeItem数组包含的id来从数组a中删除对象。我怎么能用lodash实现。

I Checked lodash's _.remove method, but this need a specific condition to remove an item from array. But i have list of ids which i want to remove.

我检查了lodash的_.remove方法,但这需要一个特定的条件来从数组中删除一个项目。但我有我要删除的ID列表。

2 个解决方案

#1

As you mentioned you need the _.remove method and the specific condition you mention is whether the removeItem array contains the id of the checked element of the array.

正如您所提到的,您需要_.remove方法,并且您提到的具体条件是removeItem数组是否包含数组的checked元素的id。

var removeElements = _.remove(a, obj => removeItem.includes(obj.id));
// you only need to assign the result if you want to do something with the removed elements.
// the a variable now holds the remaining array

#2

You have to pass a predicate function to .remove method from lodash.

您必须从lodash将谓词函数传递给.remove方法。

var final = _.remove(a, obj => removeItem.indexOf(obj.id) > -1);

using indexOf method.

使用indexOf方法。

The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.

indexOf()方法返回可在数组中找到给定元素的第一个索引,如果不存在,则返回-1。

You can do it using native javascript using filter method which accepts as parameter a callback function.

您可以使用本机javascript使用filter方法来执行此操作,该方法接受回调函数作为参数。

var a = [
  {id: 1, name: 'A'},
  {id: 2, name: 'B'},
  {id: 3,  name: 'C'},
  {id: 4, name: 'D'}
];
var removeItem = [1,2];
a = a.filter(function(item){ 
   return removeItem.indexOf( item.id ) == -1; 
});
console.log(a);

But filter method just creates a new array by applying a callback function.

但是filter方法只是通过应用回调函数来创建一个新数组。

From documentation:

The filter() method creates a new array with all elements that pass the test implemented by the provided function.

filter()方法创建一个新数组,其中包含通过所提供函数实现的测试的所有元素。

If you want to modify the original array use splice method.

如果要修改原始数组,请使用splice方法。

var a = [
  {id: 1, name: 'A'},
  {id: 2, name: 'B'},
  {id: 3,  name: 'C'},
  {id: 4, name: 'D'}
];
var removeItem = [1,2];
removeItem.forEach(function(id){
   var itemIndex = a.findIndex(i => i.id == id);
   a.splice(itemIndex,1);
});
console.log(a);

#1