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Check for illegal number with isNaN() in JavaScript
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
Updated on: 14-Sep-2020
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