Syntax of sleep function: sleep(delayTime in milliseconds). First, we will discuss how to use the sleep function and execute the JavaScript code to understand the notion of the JavaScript sleep Function. Users have to use an alternative way to pause or delay their program. Along with the JavaScript Promise, some other functions and methods can prove to be helpful to execute sleep kind of functionality in JavaScript, like the async/await functions.Īs we have already discussed, JavaScript does not have any sleep function. So, it allows users to use the Promise object to deal with all asynchronous actions. The working of JavaScript has an asynchronous action. This article will show how to use the JavaScript sleep function and the alternative method for using sleep from an external code to get the functionality of the sleep function. The behavior of JavaScript is asynchronous, so there is a concept of promises. Unlike other programming languages, JavaScript does not allow the execution of a built-in sleep() function.Įither the user needs to create a custom sleep() function using the built-in setTimeout() function, or they can use the latest ECMAScript promises like the async-await function. The await is used to wait for a promise and can only be used in an async function. To pause execution in any programming language for a fixed amount of time, programmers use the sleep() function, which is also possible in JavaScript.
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