Over the past year, Facebook has converted nearly all of its PHP code base to Hack ... which is basically a superset of JavaScript that, like Hack, adds static typing. Both projects set out ...

Instead, Gordon is a JavaScript runtime written by Tobias Schneider ... A runtime is a collection of software that allows the running of code inside it. A helpful analogy is a software emulator ...

The hack exploited a JavaScript command called 'onmouseover ... "The exploit waits for a mouse to roll over a tweet, then it tries to run code which opens a browser or displays a pop-up," said ...