为什么我的let变量不更改或过滤?

我想按id过滤我的产品(删除一个)。

如果我控制台日志,它可以正常工作,但变量没有改变,arr是一样的。为什么?

const express = require('express');

const bodyParser = require('body-parser');

const app = express();

const path = require('path');

app.use(express.json());
app.use(express.urlencoded());

const js = require('./translation.json');

 app.use('/public', express.static('public'));

let mockProducts = [
  {
    id: '12',
    name: 'Gucci Bag3212',
    desc: 'Lorem ipsum dolor sit amet.',
    photos: [
      {
        image_id: '15',
        photo: 'https://picsum.photos/590/590'
      },
    ],
    price: 19.99,
  },
  {
    id: '13',
    name: 'Leather Shoes',
    desc: 'Lorem ipsum dolor sit amet',
    photos: [
      {
        image_id: '16',
        photo: 'https://picsum.photos/590/590'
      },
    ],
    price: 19.99,
  }
];

app.put('/remove_product/:id', (req, res) => {
 mockProducts.filter(el => el.id !== req.params.id);
 res.json({});
});

app.listen(4000, () => {
  console.log('LISTEN')
});

如果我把控制台记录下来,我会得到正确的产品:

id = 12
console.log(mockProducts.filter(el => el.id === req.params.id)) = 
  {
    id: '12',
    name: 'Gucci Bag3212',
    desc: 'Lorem ipsum dolor sit amet.',
    photos: [
      {
        image_id: '15',
        photo: 'https://picsum.photos/590/590'
      },
    ],
    price: 19.99,
  },

我非常感谢你的帮助我不明白为什么它不起作用arr没有改变