Question 234528 in Javascript Question posted in
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Javascript – How to multithread a for loop?

In JavaScript if I need a for loop multithreaded, what is the simplest possible way to do this (browser or node)?

So that

For x in 5: print (x)

Would run each for loop pass in parrelell. It doesn’t matter if they happen in order.

Is this possible to do simply?
Is this even a thing?

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2

Answers


  1. 0

    JavaScript runs in a single line, one thing at a time. If you want to do a "for loop" in multiple lines at once, you can use something called Web Workers in browsers or worker_threads in Node.js.

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  2. 0

    JavaScript is single-threaded due to its event-driven and non-blocking I/O nature. You can’t achieve true multi-threading directly.
    Though, you can achieve concurrent execution using technique like Web Workers in the browser.
    This will not give you true multi-threading, but can help you run code concurrently in separate threads.

    Here’s an example of how you can achieve that using Web Workers in a browser environment:

    Script in HTML:

    <body>
  <script>
    //create multiple web workers
    const numWorkers = 5;
    const workers = [];

    for (let i = 0; i < numWorkers; i++) {
        const worker = new Worker('worker.js');
        workers.push(worker);

        worker.postMessage(i); //send data to the worker
    }

    //listen to messages from workers
    workers.forEach((worker, index) => {
        worker.onmessage = (event) => {
            console.log(`Worker ${index} returned: ${event.data}`);
        };
    });
  </script>
</body>

    Create the worker script that does the work:

    //worker.js
self.onmessage = function(event) {
  let x = event.data;

  //perform some work here
  let result = `Result for ${x}`;

  //send the result back to the main thread
  self.postMessage(result);
};
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