I was wondering how all this could work in a browser, and to my surprise it appears there's a pretty well-developed project that has a bunch of language interpr

I was wondering how all this could work in a browser, and to my surprise it appears there's a pretty well-developed project that has a bunch of language interpreters working in the browser via Emscripten (discovered via viewing coderpad.io's source): http://replit.github.io/jsrepl/ http://replit.github.io/jsrepl/ It appears to have been developed by/for http://repl.it/ http://repl.it/, which is education- rather than interview-oriented.