# setTimeout & setInterval — JavaScript

Source: https://www.geekswithgeeks.com/en/javascript/js-timers

> Scheduling code to run later or repeatedly.

## setTimeout

Runs a callback once, after at least the given delay in milliseconds.

```js
const id = setTimeout(() => console.log("Runs once, later"), 2000);
clearTimeout(id);  // cancels it before it fires
```

## setInterval

Repeats a callback on a fixed interval until explicitly cleared.

```js
const id = setInterval(() => console.log("Tick"), 1000);
setTimeout(() => clearInterval(id), 5000);
```

## Not guaranteed exact

The delay is a **minimum**, not a guarantee — a busy call stack can delay a timer's callback.