How to get post by slug in Wordpress?

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Hello guys! I need to get WP post ID by its slug. Is it possible? If so, can anybody help me with function?
Related CMS:
Hi Tony. The easiest way to get post ID by slug:
   $queried_post = get_page_by_path('my_slug',OBJECT,'post');

Also, maybe recommendation from Codex will be helpful for you:
$the_slug = 'my-slug';
$args = array(
	'name'           => $the_slug,
	'post_type'      => 'post',
	'post_status'    => 'publish',
	'posts_per_page' => 1
$my_posts = get_posts( $args );
if( $my_posts ) {
	echo 'ID on the first post found ' . $my_posts[0]->ID;

BTW, why you need to get post ID by slug?
Zahid Hossain
But i get error when i use get_page_by_path() with WP_Query. Because get_page_by_path() first and required parameter is string and WP_Query is an object.
my code is below. And i get error while i use below code in a class:
Catchable fatal error: Object of class WP_Query could not be converted to string in C:\wamp\www\wordpress-theme-test\wp-includes\post.php on line 4470

$pages = array( 'member-login', 'member-account', 'member-register', 'member-password-lost', 'member-password-reset' );

foreach ( $pages as $slug ) {
$query = new WP_Query( 'pagename='. $slug );

$page = get_page_by_path( $query );
wp_delete_post( $page->ID, true );

I there any way to solve it???