What is the difference between setImmediate() and setTimeout() in NodeJS?
Last Updated :
13 Feb, 2024
setImmediate()
:
setImmediate Executes immediately after the current event loop iteration, making it ideal for time-sensitive tasks without delay. It has higher priority than other I/O events and timers, potentially causing starvation of other tasks due to its immediate execution.
setTimeout()
:
Executes after a specified delay (in milliseconds), making it suitable for implementing delays or timeouts in code. It has a lower priority compared to setImmediate()
, reducing the likelihood of starving other tasks in the event loop.
Difference between setImmediate() and setTimeout() in NodeJS:
setImmediate() |
setTimeout() |
Executes immediately after the current event loop iteration |
Executes after a specified delay (in milliseconds) |
Has higher priority than other I/O events and timers |
Has lower priority compared to setImmediate() |
Useful for executing code immediately after the current I/O operation or in the same event loop iteration |
Useful for delaying the execution of code for a specific duration |
Executes after I/O callbacks but before any timers |
Executes after all I/O callbacks and some timers |
Can cause starving of other tasks due to higher priority |
Less likely to starve other tasks due to lower priority |
Ideal for executing time-sensitive code without delay |
Ideal for implementing delays or timeouts in code |
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