Question 1

What is the main difference between setTimeout() and setImmediate()?

Accepted Answer

setTimeout() executes in the Timers Phase, while setImmediate() executes in the Check Phase of the Event Loop.

Question 2

Which executes first: setTimeout() or setImmediate()?

Accepted Answer

The order is not always guaranteed. It depends on the Event Loop state and execution context.

Question 3

Does setTimeout(fn, 0) execute immediately?

Accepted Answer

No. It schedules the callback for the Timers Phase after at least the specified delay.

Question 4

When should I use setImmediate()?

Accepted Answer

Use setImmediate() when you want to defer execution until the Check Phase, especially after I/O operations.

What is the main difference between setTimeout() and setImmediate()?

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