There is no JS in this post, it is pseudo-code for a wholly different kind of language/runtime system: > Let’s rewrite the program above using a sort of new “l

There is no JS in this post, it is pseudo-code for a wholly different kind of language/runtime system: > Let’s rewrite the program above using a sort of new “language” with different execution semantics. The semantics of it seem to be "wait for an event with some tags".