Recursive `setTimeout` vs. `setInterval`: Which is Better for Precise Timing in JavaScript?

Recursive setTimeout vs. setInterval: Exploring the Differences

In JavaScript, controlling the execution of functions at specific intervals is crucial for many applications. This task can be accomplished using either the recursive setTimeout approach or the setInterval method. While they both aim to execute a function periodically, there are subtle but important distinctions between the two.

Recursive setTimeout

In the recursive setTimeout approach, a function (e.g., myTimeoutFunction) is called at a specified interval (e.g., 1000ms). Within that function, it performs its intended task(doStuff()) and schedules the next execution of itself via setTimeout.

setInterval

The setInterval method, on the other hand, schedules a function (e.g., myTimeoutFunction) to be executed repeatedly at the specified interval (e.g., 1000ms). It automatically handles the scheduling of subsequent executions without requiring recursive calls.

Accuracy and Delay

The most significant difference lies in their timing behavior. While both execute functions at the intended interval, setInterval is typically more accurate.

setTimeout waits 1000ms, runs the function, and then schedules another timeout. This means the actual wait period can exceed 1000ms, especially if the function takes a long time to execute.

Although setInterval seems like it should execute precisely every 1000ms, it's important to note that JavaScript is not a multi-threaded language. If other parts of the script are running, the interval must wait for them to finish, causing delays.

In situations where precise timing is critical, a self-adjusting timer should be considered. This timer constantly monitors the delay and adjusts itself to ensure the specified interval is maintained as accurately as possible.

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