Timeout

setTimeout adds the callback into the loop, in order that it was added. But you should also take into account that there can be some time between what you added and what you fired.

console.log("a");

const time1 = setTimeout(() => {
  console.log("b");
}, 1);

const time2 = setTimeout(() => {
  console.log("c");
}, 10);

const time3 = setTimeout(() => {
  console.log("d");
}, 0);

console.log("e");

What would the input be?

Initially I thought it'd be a,e,d,b,c but that's wrong because I was thinking that because the the setTimeout would take into account delay that it'd place the d before the b. However because the time that it takes for the a,e to print out is theoretically a millisecond that it'd might as well be the same time as 0. It's just that because in the eventloop the b was placed before the c then it would fire first.

Answer: a,e,b,d,c

Resources

• https://www.youtube.com/watch?v=USbiLiF9NDY&t=194s