Modern JavaScript engines are able to generate very good machine code. Wouldn’t it be a waste to write in C those parts of the language that can be expressed in JavaScript itself? I will talk about how this is works in different virtual machines, and how this makes it a breeze to modify V8 in particular. Transcript & slides: http://2014.jsconf.eu/speakers/adrian-perez-de-castro-javascript-in-javascript-inception.html License: For reuse of this video under a more permissive license please get in touch with us. The speakers retain the copyright for their performances.