![]() Checking the myTimeout.hasRef() objectįor the example above, the output will be as follows: true Because there is no other event keeping the event loop going in this situation, it will end before the callback to setTimeout() is executed: const myTimeout = setTimeout(myGreeting, 5000, "Pascal") Unref() is a Timeout method that notifies the Timeout object that the Node.js event loop is no longer required. Here’s an example of the setInterval() function: function myInterval() !`) SetInterval(), like setTimeout(), requires three arguments: It is most useful for repeating a piece of code with a millisecond delay. ![]() SetInterval() causes an indefinite loop to be executed. One real life use case of a setTimeout() function is a countdown to a flash sale in an ecommerce app. SetTimeout() returns a Timeout object, which may be used to terminate the timeout using the clear method known as clearTimeout(). The third parameter, Pascal, is a string that is passed to the myGreeting() function as its argument. The execution of the timeout can be slightly delayed due to other executing codes that run in the event loop. Here’s an example of the setTimeout() function: const myTimeout = setTimeout(myGreeting, 5000, "Pascal") īecause of the setTimeout call, the function in the above example, myGreeting(), will execute after close to 5000 milliseconds (or 5 seconds). Third (optional): an argument to be passed to the function.The setTimeout() function takes three arguments: A string of code, on the other hand, cannot be passed to be executed. It is similar to the JavaScript API’s tTimeout() function in browsers. SetTimeout() can be used to set code execution after a certain period of time has passed (in milliseconds). Let’s explore the timer functions in Node.js: setTimeout() Timer methods are globally available to imitate the browser JavaScript API, hence they do not need to be imported via require(). The Node.js timer module contains functions that run code after a set amount of time. We’ll look at examples for setTimeout(), clearTimeout(), and other Node.js timer functions. In this article, we’ll focus on the timers phase. The event loop has six different phases: timers, pending callbacks, idle or prepare, poll, check, and close callbacks. The event loop is used to implement the asynchronous functionality of Node.js.Īn event loop is a single-threaded semi-infinite loop that executes I/O or timer callbacks sequentially using a set of queues. Node.js has various inbuilt methods that make managing asynchronous tasks easier compared to other server-side programming languages. Pascal Akunne Follow A JavaScript developer focused on building human-centric products with HTML, CSS, React, Node.js, and MongoDB Using setTimeout() and other timer APIs in Node.js
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