3 ms·

When you say "they", I assume you mean "browsers"? Sorry for the dumb question. I know precious little about web programming and concurrency.

• Izkata 7y ago
  Except for webworkers (relatively new, I've not used them and know little about them), javascript in browsers is single-threaded. Even asynchronous things like ajax requests can only handle the result once the thread finishes doing whatever it was doing.
  • 7thaccount 7y ago
    Interesting and thanks for the explanation. Does it have to be single threaded?
    • ProfHewitt 7y ago
      JavaScript in browsers was decreed by the standards committee to be single-threaded forever. Consequently, JavaScript is entirely lacking in concurrency constructs, e.g., implementing a region of mutual exclusion inside a JavaScript program.
      • 7thaccount 7y ago
        Thanks! I assume that was for a reason? Or just oversight?