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function wp_get_nav_menu_object( $menu ) {
if ( ! $menu )
    return false;

$menu_obj = get_term( $menu, 'nav_menu' );

if ( ! $menu_obj )
    $menu_obj = get_term_by( 'slug', $menu, 'nav_menu' );

if ( ! $menu_obj )
    $menu_obj = get_term_by( 'name', $menu, 'nav_menu' );

if ( ! $menu_obj )
    $menu_obj = false;

return $menu_obj;
}

I know that has_nav_menu can be used to check if a nav menu has been assigned to a theme location however not sure what the code above does as the docs for this function are limited.

I need to check if the nav menu exists and the theme location is supported by the theme.

Code Source http://queryposts.com/function/wp_get_nav_menu_object/

1

The answer is in the source code that you posted.

The code attempts to get the menu by ID using get_term, then by slug and name using get_term_by. If nothing is found it returns false, here:

if ( ! $menu_obj )
    $menu_obj = false;

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