Repeatedly call a function in JavaScript

This post will discuss how to repeatedly call a function or execute the specified code in JavaScript.

1. Using `setInterval()` method

The following solution uses the setInterval() method to repeatedly call a function with a specified time delay between each call. To stop the timer, pass the return value of setInterval() to the clearInterval() method.

const x = 2; // 2 seconds

function fun() {

console.log(`Called after ${x} seconds…`);

}

setInterval(function() {

fun(); // does some work

}, x * 1000);

2. Using `setTimeout()` method

Another approach is to use the setTimeout() method, which is used to execute a function or code snippet once the specified time is elapsed. The following code example uses setTimeout() with a self-executing anonymous function.

const x = 2; // 2 seconds

(function() {

// do some work

console.log(`Pausing for ${x} seconds…`);

setTimeout(arguments.callee, x * 1000);

})();

The above code uses arguments.callee() to get the anonymous function’s name. ES5 forbids the use of arguments.callee() and suggest giving the function expressions a name:

const x = 2; // 2 seconds

fun = function() {

// do some work

console.log(`Pausing for ${x} seconds…`);

// work ends

setTimeout(fun, x * 1000);

}

fun();

That’s all about repeatedly call a function in JavaScript.

Repeatedly call a function in JavaScript

1. Using setInterval() method

2. Using setTimeout() method

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1. Using `setInterval()` method

2. Using `setTimeout()` method