Beginner question : How to get data collected from url in laravel?

Im trying to use the if statement in blade template to show and hide section based on tab clicked. If I do ['no' =>'1'], I get $name = 1. but if I do ['no' =>''], it return nothing.How should I write to get $name = 1 with ['no' =>'']?

---

web.php

Route::get('/welcome/{no}', function () {
    return view('welcome',['no' =>'']);
});

---

welcome.blade.php

@if ($no == 1)
    @include('post.article')
@else
    @include('post.event')
@endif

via Chebli Mohamed