JavaScript auto increment variable | Example code

Incremental operator ++ used to increase the existing variable value by 1 (x = x + 1). Increment operators in JS programming used in For Loop, While loop, and Do While loops.

  • ++i (Pre increment): It will increment the value of i even before assigning it to the variable i.
  • i++ (Post-increment): The operator returns the variable value first (i.e, i value) then only i value will incremented by 1.

JavaScript auto-increment variable example code

Here is HTML example code of auto increment x and y variables in JS.

<!DOCTYPE html>
<html>
<body>

    <script>
        var x = 0;
        //pre-increment
        ++x;
        console.log(x);

        //post-increment
        var y = 1;
        y++;
        console.log(y);

        </script>

</body>
</html>

Output:

JavaScript auto increment variable HTML Example code

Auto increment variable value by 2

<script>
        var x = 0;
        
        x= 2+x;
        console.log(x);
</script>

Do comment if you have any doubts and suggestions on this topic.

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

OS: Windows 10

Code: HTML 5 Version


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