Sure, node.js is implemented in multiple languages. But when people talk about writing code in node.js, they mean writing javascript. It's a javascript runtime,

Sure, node.js is implemented in multiple languages. But when people talk about writing code in node.js, they mean writing javascript. It's a javascript runtime, after all; it says so right on the front page of https://nodejs.org/en/ https://nodejs.org/en/ and even has js in the name. :-) Saying "of course node.js supports multiple threads of concurrent computation, you just have to write in c++ instead of javascript" is missing the point of why people use it.