Javascript - 在数组中查找重复项

Question

我想在特定数组中找到重复项，因为我有以下内容：

    this.drivers.filter((driver)=>{
      if(driver.userId == driverId){
      //this is used to updates the user location in real-time (lat, long), that's why I am removing the old location and pushing the new location
      this.removeDriver(driver.userId)
      this.pushNewDriver(lat, long, driverId);
}
else{
   //if the driver does not exists already in the array, then push it
        this.pushNewDriver(lat, long, driverId);
}
})



removeDriver(userId){
      this.drivers = this.drivers.filter((user) => {
      return user.userId !== userId;
    });
}

 pushNewDriver(lat, long, userId) {
let currentLontLat = { "lat": lat, "long": long };

 this.drivers.push({ "userId": userId, "currentLocation": currentLontLat });

}

我想要更具体地做的是更新特定驱动程序的信息（例如带有Id的驱动程序： sajk2299o ）但是，使用上面的代码，有时它会按预期工作（删除数组中的驱动程序并推送其新位置）有时它不会删除旧位置并自动添加新位置（不知何故它不尊重driver.userId == driverId并直接转到else）。

我相信我在这里遗漏了一些东西，但我无法弄明白。