Make a JavaScript Function Sleep
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Unlike many other languages, JavaScript doesn’t have a built-in function to pause execution for a given period of time. There’s
a good reason for this: in languages like C, sleep(2) blocks the current thread for 2 seconds. Since JavaScript is single-threaded, C-style sleep(2) would block the entire JavaScript runtime for 2 seconds, and that isn’t very useful.
However, you can pause an async function call without blocking the rest of the JavaScript runtime. You just need to await on a promise that resolves after a given period of time.
function sleep(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
async function run() {
// Pause execution of this async function for 2 seconds
await sleep(2000);
console.log('Waited for 2 seconds');
}The new Promise() call uses JavaScript’s promise constructor to create a new promise that resolves after ms milliseconds. And when
you await on a promise, you pause execution of that function until the promise resolves, without impacting other functions.
For example, you can call two functions in parallel that call sleep(), and neither function will block the other.
const start = Date.now();
async function pauseMe() {
await sleep(2000);
console.log('MS since start:', Date.now() - start);
}
// Will print something like "MS since start: 2006"
pauseMe();
// Will print something like "MS since start: 2010"
pauseMe();JavaScript Fundamentals for Make a JavaScript Function Sleep
JavaScript is a programming language that is used to create interactive web pages. It is a client-side scripting language, which means that it runs on the user’s browser. JavaScript can be used to add animation, interactivity, and functionality to web pages.
Here are some of the fundamentals of JavaScript:
- Variables: Variables are used to store data. They are declared using the
varkeyword. - Data types: JavaScript has a variety of data types, including strings, numbers, booleans, objects, and arrays.
- Operators: Operators are used to perform operations on data.
- Control flow statements: Control flow statements allow you to control the order in which your code is executed.
- Functions: Functions are blocks of code that can be reused.
- Objects: Objects are used to store data in key-value pairs.
- Arrays: Arrays are used to store data in a sequential order.
- Events and event handlers: Events are notifications that are sent by the browser when something happens, such as when the user clicks on an element or moves the mouse over an element. Event handlers are functions that are called in response to an event.
- DOM manipulation: The Document Object Model (DOM) is a tree-like structure that represents the elements of a web page. JavaScript can be used to manipulate the DOM to change the appearance or behavior of a web page.
These are just some of the fundamentals of JavaScript. There are many other concepts that you can learn as you continue to develop your skills.
Here are some resources that you can use to learn more about JavaScript:
- Mozilla Developer Network (MDN): The MDN is a great resource for learning about JavaScript. It has a comprehensive reference guide, tutorials, and articles on a wide range of topics.
- W3Schools: W3Schools is another great resource for learning about JavaScript. It has interactive tutorials and quizzes that can help you learn the basics of the language.
- JavaScript.info: JavaScript.info is a website that provides in-depth tutorials on JavaScript. It also has a forum where you can ask questions and get help from other JavaScript developers.
I hope this helps!
Here are some additional tips for learning JavaScript:
- Start with the basics: Before you start trying to build complex applications, it’s important to learn the basics of JavaScript. This includes things like variables, data types, operators, and control flow statements.
- Practice regularly: The best way to learn JavaScript is to practice regularly. Try to find some time each day to work on JavaScript projects.
- Get help from others: If you get stuck, don’t be afraid to ask for help from others. There are many online forums and communities where you can get help from other JavaScript developers.
With a little practice, you’ll be able to learn JavaScript and start building amazing web applications.
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