Skip to content

JavaScript eval() function

  • by

The eval() function in JavaScript is a built-in function that allows you to evaluate a string of code as if it were a JavaScript statement or block. It takes a single argument, which is the string to be evaluated.


JavaScript eval() function example

A simple example code passes the codeString variable as an argument to the eval() function, which evaluates it as if it were a JavaScript expression.

<!DOCTYPE html>
    let x = 5;
    let y = 10;
    let codeString = "x + y";
    let result = eval(codeString); 



JavaScript eval() function

Another example

let userCode = "let x = 10; let y = 20; x + y";
let result = eval(userCode); // 30

Comment if you have any doubts or suggestions on this Js basic topic.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.

OS: Windows 10

Code: HTML 5 Version

Leave a Reply

Your email address will not be published. Required fields are marked *