Therefore, the above sleep() method will only suspend the execution of the function where you'll call it. The sleep() would remain the active process, meaning that other events may not be processed straight away - which means your browser would appear to stop. Remember that due to the asynchronous nature of JavaScript, it is not possible to stop the entire program execution. A Javascript sleep() function (especially the way it's been implemented in another answer here) would basically have the effect burn up your CPU cycles while it waited for the clock. But after the introduction of promises in ES6, we can easily implement such a feature in JavaScript to make a function sleep: const sleep = ( ms ) => timer ( ) // Start time -> T08:42:34.754Z // After 2s -> T08:42:36.763Z // After 4s -> T08:42:38.764Z However, this functionality is not available in JavaScript due to its asynchronous execution model.

In this code, Print first is displayed first and then the function execution is paused for 2 seconds before the next line of code is executed.Similarly, PHP has sleep(2), and Python has time.sleep(2) to make the program stops for 2 seconds. Where this API isnt supported, an empty silent video is played to emulate this behaviour (using NoSleep.js). These functions allow us to use the sleep () function as easily as possible. There is, however, a way to make a sleep function in using the async/await function in ES 2018. In python, there is the time library which contains a sleep () function. In programming languages like C, Ruby, or Python pausing or delaying function execution is pretty straightforward as you would only need to call the sleep function.įor instance, consider the following Python function: import time In java, it is possible to do a sleep using threads.

However, there are different methods you can use to implement its functionality. The Node.Js sleep function does not exist.

How can we sleep or delay using Node.Js Javascript?