Here's a simple example of a 5-second sub-process queuing up parameters for a 4-second main process in a non-blocking manner. In order to "wait" in javascript using promises are the way to go as the top answers show. Using the fat arrow operator, though, makes it even smaller (and more elegant). Simple and elegant sleep function using modern Javascript function sleep(millis), millis) You can use it today by using webpack 5 (alpha), In the top level like in this example await sleep(1000) Soon you will be able to use the await syntax outside of an async function. No need to provide command line arguments. Update June 2019: By using the latest versions of NodeJS you can use it out of the box. You can use the new async/await syntax.įor using async/await out of the box without installing and plugins, you have to use node-v7 or node-v8, using the -harmony flag. Today ( Jan 2017 June 2019) it is much easier. If this argument is omitted, a value of 0 is used, meaning execute immediately, or more accurately, as soon as possible. 2: The time, in milliseconds (thousandths of a second), the timer should wait before the specified function or code is executed. setTimeout () method sleeping for 3 seconds If you omit the second parameter, then setTimeout () will immediately execute the passed function without waiting at all. > await delay(1000) /// waiting 1 second.Ī new answer to an old question. 1: A function to be executed after the timer expires. > const delay = ms => new Promise(resolve => setTimeout(resolve, ms)) In vanilla JavaScript - we can use the built-in setTimeout() function to "sleep"/delay code execution: setTimeout( function ( ), 1000) Ĭonst timeout2 = setTimeout(printMessage, 2000) Ĭonsole.Update Jan 2021: You can even do it in the Node REPL interactive using -experimental-repl-await flag $ node -experimental-repl-await This syntax is not recommended for the same reasons that make using eval () a security risk. code An alternative syntax that allows you to include a string instead of a function, which is compiled and executed when the timer expires.
In this short guide, we’ll learn how to wait in JavaScript - or rather, how to sleep/delay code execution, using the setTimeout() function. A function to be executed after the timer expires. Note: Delaying Code Execution is colloquially known as "sleeping" or less commonly as "waiting".
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