The implementation of such a sleep function, involves 'Promisifying' the setTimeout function, and then using the Async/Await syntax to provide a synchronous feel to a rather asynchronous function. For a quick recap of the syntax involved, see Callback, Promise and Async/Await by Example in JavaScript.

We can implement such a sleep function by combining the capabilities of Promises and Async/Await in JavaScript. But this is not to say we can't implement one! Unfortunately, this does not exist natively in JavaScript. console.log('Executing code.') Ī more convenient option would be to have something similar to: console.log('Executing code.') This is due to the fact that setTimeout is an asynchronous function, hence one would have to continue the execution of the code, in the callback passed to it, after the elapsed time. The only problem is, using setTimeout is not as convenient as one would like. JavaScript does not have a similar sleep function, although it has the setTimeout function which can be used to achieve a similar purpose. Though JavaScript does not have a sleep function, due to the introduction of Promises and async/await in ES2018, we can end up causing the function to sleep. Not surprising this functionality is often implemented via a function usually named sleep. Application of time.sleep () There are many applications that sleep () is used for. Most popular mainstream languages have a sleep functionality that allows for the pausing of code execution for a specified amount of time.

Javascript time sleep