If this argument is omitted, a value of 0 is used, meaning execute “immediately”, or more accurately, as soon as possible.
Nodejs sleep code#
I realized that I could exploit this functionality by building a Promise around Javascript’s built-in setTimeout () method.ġ: A function to be executed after the timer expires.Ģ: The time, in milliseconds (thousandths of a second), the timer should wait before the specified function or code is executed. This is great for handling fetch requests and other time consuming processes, but it also gives us a way to tell our app to wait to process certain statements until exactly when we want them to be run. Javascript uses Promises to track the resolution of those background processes, allowing us to set certain statements to run only when a time-consuming process has resolved and returned its completed result. If you’re not familiar with JS Promises, it’s important to first understand that while Javascript is single-threaded (meaning it can only process one statement at a time), it is also asynchronous (meaning it can start processing a new statement before the previous statement has resolved, allowing it to multitask time-consuming processes in the background.). I decided there had to be a way to construct my own dupe of that handy little method. When learning JavaScript for the first time, one of the biggest challenges is understanding the event loop. Theyre showing what a well rested NodeJS function looks like. It was so nice to be able to schedule events to the exact time I wanted them to run! Making NodeJS Functions Sleep javascript node. I knew that if I could just pause for half a second between the scroll and the API Fetch, everything would look much smoother. I wanted a way to slow things down, so the user would only see one thing happening on the page at a time. However, the the combo of the page scrolling up and the image fetch simultaneously re-firing looks pretty messy. We can just scroll up the window, then trigger a new click event on the button we’ve assigned to the variable button. In this case, we’re going to click the button that re-starts the fetch and display cycle. The Timers module in Node.js contains functions that execute code after a set period of time. Once that promise resolves, we can enter the action we want delayedClick () to enact. You may need certain lines of code to execute at a point in the future, when you explicitly specify, rather than all the code executing synchronously.
setTimeout () Dionysia Lemonaki Sometimes you might want to delay the execution of your code.
Nodejs sleep how to#
If you just quickly skim the setTimeout () docs, it seems to take a delay parameter, measured in milliseconds. We’re using our brand new sleep () function as the awaited promise, passing in our desired number of milliseconds (in this case, 700ms, or 7/10ths of a second ). JavaScript Wait How to Sleep N Seconds in JS with. Java has Thread.sleep(2000), Python has time.sleep(2), Go has time.Sleep(2 * time.Second).Enter fullscreen mode Exit fullscreen mode 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. In a programming language like C or PHP, you’d call sleep(2) to make the program halt for 2 seconds. Sometimes you want your function to pause execution for a fixed amount of seconds or milliseconds. Learn how to make your function sleep for a certain amount of time in JavaScript
0 kommentar(er)
