ECMAScript

Building Flash (or coding ActionScript) based application is much faster than coding JavaScript based web applications.  Although ActionScript (Flash) applications rely on the Flash Player plug-in, its  penetration is quite high nowadays.

Yes, ActionScript™ 3.0 is an inheritance-based, object-oriented scripting language based on ECMAScript developed by Macromedia (now acquired by Adobe) . It is used to program application logic and events. Reference ActionScript Technology Center