how to pass variable from view to controller in laravel code example

Example 1: how to pass data to controller in laravel

$dept = DB::table('master_department')->get();
$design = DB::table('master_designation')->get();
return view('registration', ['dept' => $dept], compact('design'));

#if we send as array
@foreach($dept as $key=>$d)
	{{ $dept[$key]->dept_title }}
@endforeach

#if we send as compact object
@foreach($design as $deg)
	<option value="{{ $deg->id }}">{{ $deg->deg_title }}</option>							
@endforeach

Example 2: passing data from controller to blade view laravel

Route::get('eventpage', 'EventController@index')->name('eventpage');