Explain the working of timers in JavaScript

In JavaScript, timers are used to execute a piece of code at a specific time or repeatedly after a certain interval. There are two types of timers in JavaScript:

• setTimeout(): This method is used to execute a piece of code once after a specified delay.

Syntax: setTimeout(function, delay)

Example:

setTimeout(function() {
  console.log("Hello World!");
}, 3000);

In the above example, the function will be executed after a delay of 3 seconds (3000 milliseconds).

• setInterval(): This method is used to execute a piece of code repeatedly after a specified interval.

Syntax: setInterval(function, interval)

Example:

setInterval(function() {
  console.log("Hello World!");
}, 1000);

In the above example, the function will be executed every 1 second (1000 milliseconds).

Both setTimeout() and setInterval() return a unique ID that can be used to stop the timer using the clearTimeout() or clearInterval() methods respectively.

Syntax: clearTimeout(id) or clearInterval(id)

Example:

var timerId = setTimeout(function() {
  console.log("Hello World!");
}, 3000);

clearTimeout(timerId);

In the above example, the setTimeout() method will be cancelled before the function is executed.