javascript Typescript 按数组过滤对象数组
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Typescript filter array of objects by an array
提问by anand
I have to filter an array of objects to get certain values based on an another array and distinct also
我必须过滤一个对象数组以获取基于另一个数组和不同的某些值
Data
数据
var value:any[]
var inventory = [
{id: 1, quantity: 2, GroupId: 1},
{id: 2, quantity: 0, GroupId: 2},
{id: 1, quantity: 2, GroupId: 1}
];
//data from db
value = [1,2]
My code
我的代码
var data = this.inventory .filter(x => x.GroupId == this.value );
Not able to get the filtered data, but returning empty array. Thanks in advance
无法获取过滤后的数据，但返回空数组。提前致谢
采纳答案by Wyns
If you want to distinct by the id field here's a solution:
如果您想通过 id 字段进行区分，这里有一个解决方案：
var inventory = [
{id: 1, quantity: 2, GroupId: 1},
{id: 2, quantity: 0, GroupId: 2},
{id: 1, quantity: 2, GroupId: 1}
];
var value = [1,2]
var data = inventory.filter(x => value.indexOf(x.GroupId)>-1).filter((elem1, pos, arr) => arr.findIndex((elem2)=>elem2.id === elem1.id) === pos);
console.log(data);
JSFiddle example: https://jsfiddle.net/7xnybhLv/1/
JSFiddle 示例：https://jsfiddle.net/7xnybhLv/1/
回答by pwolaq
In your code you are comparing GroupIdwith an array. You should check if array contains GroupIdinstead.
在您的代码中，您正在GroupId与一个数组进行比较。您应该检查数组是否包含GroupId。
Here is how to do it:
这是如何做到的：
var data = this.inventory.filter(x => value.includes(x.GroupId));
For better support you can replace Array.prototype.includeswith Array.prototype.indexOf:
为了获得更好的支持，您可以将Array.prototype.includes替换为Array.prototype.indexOf：
var data = this.inventory.filter(x => value.indexOf(x.GroupId) !== -1);
回答by Aravind
You should be using includes
你应该使用包含
console.log([
{id: 1, quantity: 2, GroupId: 1},
{id: 2, quantity: 0, GroupId: 2},
{id: 3, quantity: 2, GroupId: 1}
].filter(x => [1,2].includes(x.id)));回答by Nina Scholz
You could use the variable directly and use Array#includes.
您可以直接使用该变量并使用Array#includes.
var inventory = [{ id: 1, quantity: 2, GroupId: 1 }, { id: 2, quantity: 0, GroupId: 2 }, { id: 3, quantity: 2, GroupId: 1 }],
value = [1, 2],
data = inventory.filter(({ GroupId }) => value.includes(GroupId));
console.log(data);.as-console-wrapper { max-height: 100% !important; top: 0; }