[whiterabbit]

Ideally, would you write your web application using one language, or ten?

And that is how it's relevant. Any developer who can't grasp this concept has no place working for a company producing web-based software.

[sofuture]

I would choose to write it in however many languages fit the various pieces best. To choose otherwise would be ill-advised.

[whiterabbit]

By "however many languages fit the various pieces best," did you mean the most or the fewest?

[sofuture]

I mean I wouldn't make technical decisions dogmatically.

[whiterabbit]

I think everyone here will back you up on that, but don't infer that zinxq is advocating choice by technical dogma. I read their post as simply asking for an explanation for node.js's accelerating popularity; of course there are many factors, but its ability to reduce lexical context switching is obviously a major component. To argue otherwise would be ill-advised.