从创建的列表中过滤数据

const originalList = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

// 过滤出偶数
const filteredList = originalList.filter((num) => num % 2 === 0);

console.log(filteredList); // 输出 [2, 4, 6, 8, 10]

const mongoose = require('mongoose');

// 定义数据模型
const UserSchema = new mongoose.Schema({
  name: String,
  age: Number,
});

const User = mongoose.model('User', UserSchema);

// 过滤出年龄大于等于18岁的用户
User.find({ age: { $gte: 18 } }, (err, users) => {
  if (err) {
    console.error(err);
    return;
  }

  console.log(users);
});