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This method achieves the purpose of not executing the lines of code you decide until after your timeout, while still returning control back to the client PC to execute whatever else it has queued up.Īs pointed out in the comments this will absolutely not work in a loop. Make sure your function names still accurately describe what each piece is doing (i.e., GatherInputThenWait and CheckInput, rather than funcPart1 and funcPart2) SetTimeout(continueExecution, 10000) // Wait ten seconds before continuing The way to do it is to breakdown your function into before and after parts. It executes the next line of the function immediately after the timeout is SET, not after the timeout expires, so that does not accomplish the same task that a sleep would accomplish. However, setTimeout does not hold up execution. There is no way to sleep in the way you want, nor should you pursue the solution you suggest. Your question is a bit of a false choice, then. So you are pretty much stuck with what others have suggested - you'll need to break your code up into multiple functions. If JavaScript could somehow preserve your function's execution context, store it somewhere, then bring it back and continue later, then sleep could happen, but that would basically be threading.
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Suppose I wanted to make use of your functions while writing my own? When I called your method, my methods would all freeze up. While in a specific case, it might be nice to have the whole engine wait for a few seconds, in general it is bad practice. The issue here is that JavaScript is a single-thread event-based model. If you are used to writing in multi-threaded languages, you probably have the idea of yielding execution for a set amount of time until your thread wakes up. I think it's perfectly reasonable to want to perform an action, wait, and then perform another action. If for some weird reason you're using Node older than 7 (which has reached end of life), or are targeting old browsers, async/ await can still be used via Babel (a tool that will transpile JavaScript + new features into plain old JavaScript), with the transform-async-to-generator plugin. and also landed in Firefox Nightly in November 2016.async/ await landed in V8 and has been enabled by default since Chrome 55 (released in Dec 2016).
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promises are supported in Node v0.12+ and widely supported in browsers, except IE.The async/await feature lets the code explicitly wait for a promise to settle (resolve or reject).We also use arrow functions in the definition of the sleep function. Promises, a native feature of ES2015 (aka ES6).Two new JavaScript features (as of 2017) helped write this "sleep" function: wait, but note that most browsers will not allow it on the browser's main thread. If you do want a blocking construct, see this answer using Atomics. This means it's not blocking the execution of the rest of the script, which is what you want in the vast majority of the cases. await only pauses the current async function.await can only be executed in functions prefixed with the async keyword, or at the top level of your script in an increasing number of environments.Or as a one-liner: await new Promise(r => setTimeout(r, 2000)) The tutorials include String manipulation, Date manipulation, Array and Object methods, JavaScript algorithm solutions, and many more.Return new Promise(resolve => setTimeout(resolve, ms)) Ĭonsole.log('Two seconds later, showing sleep in a loop.') If you want to learn more about JavaScript, you may want to check out my site at, where I have published over 100 tutorials about programming with JavaScript, all using easy-to-understand explanations and code examples. To cancel a setTimeout() method from running, you need to use the clearTimeout() method, passing the ID value returned when you call the setTimeout() method. You need to pass the amount of time to wait for in milliseconds, which means to wait for one second, you need to pass one thousand milliseconds. The JavaScript setTimeout() method is a built-in method that allows you to time the execution of a certain function. If you have multiple setTimeout() methods, then you need to save the IDs returned by each method call and then call clearTimeout() method as many times as needed to clear them all. You can think of the method as a way to set a timer to run JavaScript code at a certain time.įor example, the code below will print "Hello World" to the JavaScript console after 2 seconds have passed: setTimeout(function() has been cleared`) clearTimeout() method in action The setTimeout() method allows you to execute a piece of code after a certain amount of time has passed.
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This tutorial will help you to understand how the built-in JavaScript method setTimeout() works with intuitive code examples.