javascript Lodash 通过匹配 ids 数组从数组中删除对象
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Lodash Remove objects from array by matching ids array
提问by Gitesh Purbia
I have an array of objects like:
我有一个对象数组，例如：
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 :
还有我想从数组 a 中删除的 Ids 数组：
var removeItem = [1,2];
I want to remove objects from array aby matching its ids, which removeItem arraycontains. How can i implement with lodash.
我想array a通过匹配其removeItem array包含的id来删除对象。如何使用 lodash 实现。
I Checked lodash's _.removemethod, 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，但这需要特定条件才能从数组中删除项目。但是我有要删除的 ID 列表。
采纳答案by Gabriele Petrioli
As you mentioned you need the _.removemethod and the specific condition you mention is whether the removeItemarray contains the idof the checked element of the array.
正如您提到的，您需要该_.remove方法，您提到的具体条件是removeItem数组是否包含数组id的已检查元素的 。
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
回答by Mihai Alexandru-Ionut
You have to pass a predicatefunction to .removemethod from lodash.
您必须将predicate函数传递给.remove方法 from lodash。
var final = _.remove(a, obj => removeItem.indexOf(obj.id) > -1);
using indexOfmethod.
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() 方法返回可以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 nativejavascript using filtermethod which accepts as parameter a callbackfunction.
您可以使用接受回调函数作为参数的方法使用nativejavascript 来完成。filter
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 filtermethod just creates a new array by applying a callbackfunction.
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:
从文档：
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，其中包含通过提供的函数实现的测试的所有元素。
If you want to modify the original array use splicemethod.
如果要修改原始数组使用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);