Viewed k times. In our case the result of sayHi is undefined the function returns nothingso nothing is scheduled. This is called timing events. Asked 9 years, 3 months ago. And it continues. If we also want the function to run immediately, then we can add an additional call on a separate line, like this:. Code after the loop will be executed immediately, only the execution of the callback function is deferred.
The setTimeout() function is non-blocking and will return immediately.
The short answer is that the for loop executes first, then it looks for the i value, which is 5, and then outputs four times, one for each loop iteration. The runtime engine is what executes our code and each major browser has a slightly different engine under the hood.
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Help to translate the content of this tutorial to your language! SetTimeout is much better than settinterval. These APIs are run independently, in a separate process, by the browser. Super simple and worked like a charm. But forEach will not wait until all items are finished.
const output = document. JS for loop with delay in each iteration using IIFE.
But be careful with very large array too many tasks in parallel can be too heavy for CPU or memory. Then I used to use its better version:. For repeatedly calling some function every X milliseconds, one would normally use setInterval.
Note that this if statement and the subsequent calling of theLoop is not queued instantly, because all the code inside the setTimeout will only execute after 3 seconds has elapsed. If you wanted to do a million iterations, what would be a better way to implement this?
In the edge case, if the function always executes longer than delay ms, then the calls will happen without a pause at all.
JS for loop with delay in each iteration using IIFE Cybrilla TIL
This example executes a function called "myTimer" once every second like a digital watch. Active today.
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Why is it a bad practice, and why does it have memory allocation issues? The setTimeout function is non-blocking and will return immediately. Simple implementation of showing a piece of text every two seconds as long the loop is running. In this case the engine waits for func to complete, then checks the scheduler and if the time is up, runs it again immediately.