What is the best way to pause execution until a condition is met in JavaScript?

Other Questions JavaScript
1

I’m working on a JavaScript function that looks like this:

function exampleFunction(value) {
    let counter = value;
    // other initial setups
    // I need to pause execution until condition is satisfied
    while (!conditionMet) {}
    // continue processing
}

The issue I’m encountering is that this busy-waiting approach causes the program to freeze. How can I effectively pause execution in the function until the condition becomes true without resorting to busy-waiting?

2

I’ve found that you can create an event-driven system by using JavaScript’s event loop effectively. Instead of busy-waiting, consider setting up event listeners or callbacks that trigger when your condition becomes true. For instance, if the condition depends on an external event, such as user input or fetching data from an API, you can attach a callback function to that event which then continues the execution. This way, you’re not using unnecessary CPU cycles, and your application won’t freeze.

3

One approach I’ve used myself is utilizing asynchronous programming constructs such as Promises or async/await in JavaScript. Instead of directly blocking the execution, you can set up a system to continuously check the condition at intervals using setInterval or setTimeout. Wrap this logic inside a Promise, and use resolve when the condition is met. Then, use await to pause till the Promise resolves in an async function. This keeps your UI responsive and leverages JavaScript’s non-blocking nature.