laravel update and delete function using Resource controller

We can update and delete from database using  laravel 5.5 .


 public function update(Request $request, $id)
    {
         $this->validate($request,[
            'title' => 'required',
            'sub_title' => 'required',
            'image' => 'mimes:jpeg,jpg,bmp,png',
        ]);
        $image = $request->file('image');
        $slug = str_slug($request->title);
        $slider = Slider::find($id);
        if (isset($image))
        {
            $currentDate = Carbon::now()->toDateString();
            $imagename = $slug .'-'. $currentDate .'-'. uniqid() .'.'. $image->getClientOriginalExtension();
            if (!file_exists('uploads/slider'))
            {
                mkdir('uploads/slider', 0777 , true);
            }
            $image->move('uploads/slider',$imagename);
        }else {
            $imagename = $slider->image;
        }
        $slider->title = $request->title;
        $slider->sub_title = $request->sub_title;
        $slider->image = $imagename;
        $slider->save();
        return redirect()->route('slider.index')->with('successMsg','Slider Successfully Updated');
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function destroy($id)
    {
        $slider = Slider::find($id);
        if (file_exists('uploads/slider/'.$slider->image))
        {
            unlink('uploads/slider/'.$slider->image);
        }
        $slider->delete();
        return redirect()->back()->with('successMsg','Slider Successfully Deleted');
    }