setInterval() The setInterval() method, offered on the Window and Worker interfaces, repeatedly calls a function or executes a code snippet, with a fixed time delay between each call. This method returns an interval ID which uniquely identifies the interval, so you can remove it later by calling clearInterval() .
What is the difference between setTimeout and setInterval?
setTimeout allows us to run a function once after the interval of time. setInterval allows us to run a function repeatedly, starting after the interval of time, then repeating continuously at that interval.
Is setInterval callback?
setInterval(callback, ms) Executes the callback function code every time a certain number of milliseconds has elapsed, until cleared. Some apps need to execute code at a set interval, like the mole appearing every 5 seconds or so in “Whack a Mole”.
How accurate is setInterval?
The real-time interval can only be greater than or equal to the value we passed. From the above code, we can see that setInterval is always inaccurate. If time-consuming tasks are added to the code, the difference will become larger and larger ( setTimeout is the same).
Is setInterval asynchronous?
Is setInterval CPU intensive?
Really depends on the function being called and the amount of time you specify. Obviously calling a function every 100 miliseconds that is 1000 lines long will be cpu intensive. On Chrome, the interval function is only called once per second if the tab is inactive, by the way.
Is setInterval reliable?
Why you should not use setInterval?
In case of time intensive synchronous operations, setTimeInterval may break the rhythm. Also, if any error occurs in setInterval code block, it will not stop execution but keeps on running faulty code. Not to mention they need a clearInterval function to stop it.
Does setInterval run in background?
Timers methods setTimeout() / setInterval() running on background tabs can be resource exhausting. An application running callbacks at very short intervals in a background tab may drain a lot of memory to the point that the working of the currently active tab may be impacted.
Does setInterval wait for completion?
You cannot “wait” for an timeout/interval to finish – trying to do so would not work or block the whole page/browser. Any code that should run after the delay needs to be called from the callback you passed to setInterval when it’s “done”.