Issue with console output

JavaScript
1 
console.log("first");
setTimeout(function() {
    console.log("second");
}, 0);
console.log("third");

output

first
third
second

Query

0 seconds is not a delay at all . expected output should have been

first
second
third

Could you please explain why it did not work out expected way ?

2

The timeout doesn’t start counting until after the script has completed, and most browsers don’t do a zero timeout, for performance reasons. You can learn more about this at the Reasons for delays longer than specified section of the setTimeout documentation page.

3

If the script is big to execute …Will the setTimeout still wait until completed ?

4

setTImeout always waits until the current script is complete, even when it’s a big one.

1 Like
5

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