Shortcode to List Articles and Group by Category

// Add Shortcode
function articles_groupedby_category() {

	// WP_Query arguments
	$args = array(
		'post_type'              => array( 'articles' ),
		'nopaging'               => true,
		'ignore_sticky_posts'    => true,
		'order'                  => 'ASC',
		'orderby'                => 'title',
		'tax_query'              => array(
			'relation' => 'AND',
			array(
				'taxonomy'         => 'category',
				'field'            => 'name',
				'operator'         => 'EXISTS',
			),
		),
	);
	
	// The Query
	$article_query = new WP_Query( $args );
	
	// The Loop
	if ( $article_query->have_posts() ) {
		while ( $article_query->have_posts() ) {
			$article_query->the_post();
			// do something
		}
	} else {
		// no posts found
	}
	
	// Restore original Post Data
	wp_reset_postdata();

}
add_shortcode( 'wdev_art_cat', 'articles_groupedby_category' );