Loved your Treehouse courses and the Gutenberg course is great so far too.
I’m going through 04.01 and everything is pretty straightforward however I’ve never seen backslashes as you have in the enqueue-scripts.php file in the add_action sections:
add_action( 'enqueue_block_assets', __NAMESPACE__ . '\enqueue_assets' );
add_action( 'enqueue_block_assets', __NAMESPACE__ . '\enqueue_frontend_assets' );
Can you (or someone) explain why those backslashes are there and what they do?