JavaScript Throw statement

In JavaScript try...catch ... Statement, we learned how to catch a system-thrown error. JavaScript allows us to customize the error and throw the error message.

Throw statement

The throw statement allows us to create custom errors.

The correct technical term is: Create or throw an exception (exception).

If you use throw with try and catch, you can control the flow and generate custom error messages.

Throw statement syntax

Throw exception

An exception can be a JavaScript string, a number, a logical value, or an object.

In the following example, we define a division calculation function that throws an exception if the dividend of the function is 0. At the time of the call with Try...catch ... To handle:

<! DOCTYPE html>//Trigger Operation        functiondivsion (NUM1, num2) {if(num2 = = 0) {                Throw"Dividend cannot be 0"; }            returnNUM1/num2; }        functionBtn_click () {varNUM1 = number (document.getElementById ("TxtNum1"). Value); varnum2 = number (document.getElementById ("txtNum2"). Value); Try            {                varresult =divsion (NUM1, num2); document.getElementById ("Txtresult"). Value =result; }            Catch(ERR) {alert (ERR); }        }    </script>
JavaScript Throw statement