If you run test2, you will see 'hi' right away ( setTimeout is non blocking) and after 3 seconds you will see the alert 'hello'.
3 seconds and go to next line of code. defer the execution of anonymous function for Inside this folder, we will create our first test file named test.js, as shown below: Step 2: Inside test. Unfortunately, there is no sleep function like that in JavaScript. Step 1: Create a folder named tests in the project root. If you run the above function, you will have to wait for 3 seconds ( sleep method call is blocking) before you see the alert 'hi'. let's say JavaScript did have a sleep function. Remember, this is completely different from how sleep method, if it existed, would behave. setTimeout will let you defer execution of a function for x milliseconds. it will run after 3 seconds (3000 milliseconds) if you have defined a function named myFunction setTimeout will let you defer execution of a function for x milliseconds. In this article, I explain how to use setTimeout(), including how you can use it to make a sleep function that will cause JavaScript to pause execution and wait between successive lines of code.If you are looking to block the execution of code with call to sleep, then no, there is no method for that in JavaScript. The problem arises from misunderstanding setTimeout() as a sleep() function, when it actually works according to its own set of rules. You may have tried it at some point in a JavaScript loop and seen that setTimeout() seems to not work at all. Unfortunately, setTimeout() does not work quite as you might expect, depending on how you use it. “The setTimeout() method of the WindowOrWorkerGlobalScope mixin (and successor to tTimeout()) sets a timer which executes a function or specified piece of code once the timer expires.” - MDN Docs A Simple Alternative A lternatively, you can specify increasing timeouts when you call setTimeout () in the first place. There’s no sleep() method in JavaScript, so you try to use the next best thing, setTimeout(). This JavaScript sleep () function works exactly as you might expect, because await causes the synchronous execution of the code to pause until the Promise is resolved. Let’s say you want to log three messages to Javascript’s console, with a delay of one second between each one.
“In computing, sleep is a command in Unix, Unix-like and other operating systems that suspends program execution for a specified time.” - Wikipedia
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