Enqueue scripts in WordPress with defer or async

enqueue.php

<?php
// This code is based in Mathew Horne blog post: https://matthewhorne.me/defer-async-wordpress-scripts/

//function to add async attribute
function add_async_attribute( $tag, $handle ) {	
	$scripts_to_async = array( 'my-js-handle-async', 'another-handle-async' );
	//check if this script is in the array	
	if ( in_array( $handle, $scripts_to_async ) ) {
		//return with async
		return str_replace( ' src', ' async="async" src', $tag );
	} else {
		//return without async
		return $tag;
	}
}

//function to add defer attribute
function add_defer_attribute( $tag, $handle ) {	
	$scripts_to_defer = array( 'my-js-handle-defer', 'another-handle-defer' );
	//check if this script is in the array
	if ( in_array( $handle, $scripts_to_defer ) ) {
		//return with defer
		return str_replace( ' src', ' defer="defer" src', $tag );		
	} else {
		//return without async
		return $tag;
	}
}

//filter tag
add_filter( 'script_loader_tag', 'add_async_attribute', 10, 2 );
add_filter( 'script_loader_tag', 'add_defer_attribute', 10, 2 );