src/Util/AppContainer.php
private static function getInstance(): HashMap {
        if (null === self::$map) {
            self::$map = new HashMap();
        }
        return self::$map;
    }
private static function getInstance(): HashMap {
        if (null === self::$map) {
            self::$map = new HashMap();
        }
        return self::$map;
    }
private static function getInstance ( ) : HashMap { if ( null === self :: $ map ) { self :: $ map = new HashMap ( ) ; } return self :: $ map ; }
returning the Map instance.

@return HashMap
returning the Map instance .