Wordpress - Is it possible to get a page link from its slug?

You're talking about Pages right? Not Posts.

Is this what you looking for:

1. get_permalink( get_page_by_path( 'map' ) )
2. get_permalink( get_page_by_title( 'Map' ) )
3. home_url( '/map/' )

I think this could be better:

function get_page_by_slug($page_slug, $output = OBJECT, $post_type = 'page' ) {
    global $wpdb;
    $page = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_name = %s AND post_type= %s", $page_slug, $post_type ) );
    if ( $page )
            return get_page($page, $output);
    return null;
}

following the pattern of "original" get_page_by_title of wordpress. (line 3173)

rgds

This is a method published by Tom McFarlin on his blog:

/**
 * Returns the permalink for a page based on the incoming slug.
 *
 * @param   string  $slug   The slug of the page to which we're going to link.
 * @return  string          The permalink of the page
 * @since   1.0
 */
function wpse_4999_get_permalink_by_slug( $slug, $post_type = '' ) {

    // Initialize the permalink value
    $permalink = null;

    // Build the arguments for WP_Query
    $args = array(
        'name'          => $slug,
        'max_num_posts' => 1
    );

    // If the optional argument is set, add it to the arguments array
    if( '' != $post_type ) {
        $args = array_merge( $args, array( 'post_type' => $post_type ) );
    }

    // Run the query (and reset it)
    $query = new WP_Query( $args );
    if( $query->have_posts() ) {
        $query->the_post();
        $permalink = get_permalink( get_the_ID() );
        wp_reset_postdata();
    }
    return $permalink;
}

It works with custom post types and built-in post types (such as post and page).