JavaScript code to add two numbers using Call Back function

Generally, callback function not required for addition operation but it could use to show the result. Call the Addition (addNumber) function with a callback, and let the Addition (addNumber) function run the callback after the calculation is finished:

JavaScript code to add two numbers using call back function example

HTML example code:

If you want to execute a function right after the return of some other function, then callbacks can be used.

<!DOCTYPE html>
<html>
<body>
    <p id="demo"></p>

    <script>

        function result(value) {

            console.log("Call Back Funciton")
            document.getElementById("demo").innerHTML = value;
        }

        function addNumbers(num1, num2, callBackFunction) {
          let sum = num1 + num2;

          callBackFunction(sum);
      }

      // Test case  
      addNumbers(15, 15, result);

  </script>
</body>
</html>

Output:

Write a JavaScript code to add two numbers using the call back function

Note: Remember not to use parenthesis at passing a function as an argument.

Right: myCalculator(5, 5, result);

Wrong: ~~myCalculator(5, 5, result())~~;

Do comment if you have any doubts and suggestion 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

Write a JavaScript code to add two numbers using the call back function