Why is setTimeout considered non-blocking even though it is synchronous? And on which thread does it run if not the main thread?
Why is setTimeout considered non-blocking even though it is synchronous? And on which thread does it run if not the main thread?
Why doesn't the setTimeout function return a promise?
The reason is that it was created before Promises were introduced to JavaScript.
Is setTimeout considered synchronous or asynchronous?
It operates synchronously but schedules a function to be executed at a later time.
Why does setTimeout return a number instead of a promise?
The returned number is intended for use with clearTimeout.
Can await be used with setTimeout?
await can only be used with promises.
You have the option to wrap setTimeout in a promise and resolve it within the callback passed to setTimeout. Here's an example:
await new Promise( resolve => setTimeout(() => {
// Perform actions after 1 second
// then:
resolve();
}, 1000);
The setTimeout function operates synchronously. Its callback is registered by the event loop during the timer phase and will be executed in an asynchronous manner.
Timeout functions are inherently asynchronous, allowing them to be non-blocking and executed on the main thread.
In JavaScript, the callbacks of timers like setTimeout and setInterval are stored in heap memory until they expire. When a timer expires, the event loop retrieves the associated callback and executes it in order of their delay, continuing this process until the timer queue is empty.
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