![]() If you're using Windows then you maybe are in trouble with usleep if you really need to use it. If you need a large delay, there’s a chance that it may even crash things altogether.Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Predefined Attributes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search Maybe this code does exactly what you’re hoping for, but be aware that it has a large disadvantage: the loop will block JavaScript’s execution thread and ensure that nobody can interact with your program until it finishes. How to Write Better Sleep Function in JavaScript ![]() The loop will keep going while the difference between date and currentDate is less than the desired delay in milliseconds. In the loop it repeatedly gets the number of milliseconds which have elapsed since Januand assigns the value to the previously declared currentDate variable. It then creates an empty currentDate variable, before entering a do. It works by using the Date.now method to get the number of milliseconds that have elapsed since Januand assigning that value to a date variable. log ( 'World!' ) Īs expected, this will log “Hello”, pause for two seconds, then log “World!” log ( 'Hello' ) setTimeout ( ( ) => console. The standard way of creating a delay in JavaScript is to use its setTimeout method. Now that we have a better understanding of JavaScript’s execution model, let’s have a look at how JavaScript handles delays and asynchronous code. How to Use SetTimeout in JavaScript Properly If any of this is news to you, you should watch this excellent conference talk: What the heck is the event loop anyway? Rather, it will continue on its way, output “Hello!” to the console, and then when the request returns a couple of hundred milliseconds later, it will output the number of repos. It will not, however, wait for the request to complete. The JavaScript interpreter will encounter the fetch command and dispatch the request. ![]() This is because fetching data from an API is an asynchronous operation in JavaScript. If you run this code, it will output “Hello!” to the screen, then the number of public repos attributed to my GitHub account. Execution goes from top to bottom.Ĭontrast that with the equivalent JavaScript version: fetch ( '' ). ![]() ![]() It then parses the response, outputs the number of public repos attributed to my GitHub account and finally prints “Hello!” to the screen. get (uri ) )Īs one might expect, this code makes a request to the GitHub API to fetch my user data. Understanding this is crucial for effectively managing time and asynchronous operations in your code.Ĭonsider the following Ruby code: require 'net/http' require 'json' Now that we’ve got a quick solution under our belts, let’s delve into the mechanics of JavaScript’s execution model. Understanding JavaScript’s Execution Model ![]()
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