How can i print number in regular interval through setTimeout function?

Question

var i=0;
function counter(){
    for( i;i<100;i++){
        setTimeout(()=>{
            console.log(i);
        },2000)
    }
}

counter();

i wa

Answer 1

Use setInterval(), like this:

var i=0;
var intervalID;
    
function printAndIncrement()
{
    // Stop interval procedure when "var i" reach to 100.

    if (i > 100)
    {
        clearInterval(intervalID);
        return;
    }

    console.log(i);
    i++;
 }
    
 intervalID = setInterval(printAndIncrement, 1000);

Answer 2

How can i print in interval of 2 second?

'Drift' due to CPU time is a consideration.

If your use case is running code spaced 2 seconds apart minimum, use setTimeout():

let ctr = 1

const fn = () => {
  console.log(ctr++)
  setTimeout(fn, 2000) // set the next run
  }

setTimeout(fn, 2000) // set 1st run

If your use case is running code spaced 2 seconds apart maximum, use setInterval():

let ctr = 1

const fn = () => console.log(ctr++)

setInterval(fn, 2000)

More on JS CPU Timer drift here: https://johnresig.com/blog/how-javascript-timers-work/

Cheers,

Answer 3

function counter(){
for( let i=0;i<100;i++){
    setTimeout(()=>{
        console.log(i);
    },2000)
}
}counter();

Just change var to let

Answer 4

const printNumbersForEvery2Sec = (n) => {
  for (let i = 1; i <= n; i++) {
    setTimeout(() => {
      console.log(i)
    }, i * 2000)
  }
}
printNumbersForEvery2Sec(10);

Taken from here