Following is the code −
Example
function multiplication(firstValue, secondValue, callback) { var res = firstValue * secondValue; var err = isNaN(res) ? 'Something is wrong in input parameter' : undefined; callback(res, err); } multiplication(10, 50, function (result, error) { console.log("The multiplication result="+result); if (error) { console.log(error); } }); multiplication('Sam', 5, function (result, error) { console.log("The multiplication result="+result); if (error) { console.log(error); } });
To run the above program, you need to use the following command −
node fileName.js.
Here, my file name is demo201.js.
Output
This will produce the following output −
PS C:\Users\Amit\javascript-code> node demo201.js The multiplication result=500 The multiplication result=NaN Something is wrong in input parameter