Timers (setTimeout & setInterval)

Sometimes you want code to run after a delay, or repeatedly over time. JavaScript provides built-in timer functions.

setTimeout

Runs a function ONCE after a specified delay in milliseconds.

setTimeout(() => {
  console.log("2 seconds have passed!");
}, 2000);
          

setInterval

Runs a function REPEATEDLY, waiting a specific time between each run. You can stop it using clearInterval.

let count = 0;
const intervalId = setInterval(() => {
  count++;
  console.log(count);
  if (count === 5) {
    clearInterval(intervalId); // Stops the timer
  }
}, 1000);
          

Practice

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