laravel blade why use custom directive code example

Example: laravel blade directives

@can('edit', $post)
  <a href="{{ route('post.edit', $post) }}">Edit Post</a>
@endcan

@cannot('view', $post)
   <p>You cannor view this post!</p>
@endcannot

@includeWhen(auth()->user()->isAdmin(), 'admin_panel')

{{-- in your layout template --}}
@stack('scripts')
  <script src="jquery.js"></script>
@endstack

{{-- anywhere you want --}}
@push('scripts')
  <script>$(function() { $('button').click(function() { alert("Hello!"); }); });</script>
@endpush

@each('post.view', $posts, 'post', 'post.empty')

@inject('metrics', 'App\Services\MetricsService')
<div>
    Monthly Revenue: {{ $metrics->monthlyRevenue() }}.
</div>
@if(auth()->guest())
    // The user is not authenticated.
@endif
@guest
    // The user is not authenticated.
@endguest
@if(auth()->user())
    // The user is authenticated.
@endif
@auth
    // The user is authenticated.
@endauth
@guest
    // The user is not authenticated.
@else
    // The user is authenticated.
@endguest
@if(view()->exists('first-view-name'))
    @include('first-view-name')
@else
    @include('second-view-name')
@endif
@includeFirst(['first-view-name', 'second-view-name']);