JuniorTheoryCommon

What does the program print (lines separated by spaces)?

JavaScript

console.log(1);
setTimeout(() => {
    console.log(2);
}, 0);
console.log(3);

1 3 2

Expecting 1 2 3: a delay of 0 does not mean "right now"; the callback waits until the current code has finished, so 3 is printed first.
Expecting the timer to be lost when the last line ends: Node keeps the program running until the waiting setTimeout callback has run.

What does the program print if the delay is 100 instead of 0?
What does the program print if a second setTimeout(…, 0) printing 4 is added after the first?

JuniorTheoryCommon

JavaScript

console.log(1);
setTimeout(() => {
    console.log(2);
}, 0);
console.log(3);

1 3 2

Expecting 1 2 3: a delay of 0 does not mean "right now"; the callback waits until the current code has finished, so 3 is printed first.
Expecting the timer to be lost when the last line ends: Node keeps the program running until the waiting setTimeout callback has run.

What does the program print if the delay is 100 instead of 0?
What does the program print if a second setTimeout(…, 0) printing 4 is added after the first?