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Showing content from https://webplatform.github.io/docs/javascript/statements/throw below:

throw Summary

Generates an error condition that can be handled by a try…catch…finally statement.

Syntax

throw exception

Examples

The following example throws an error inside a try block, and it is caught in the catch block.

try {
         throw new Error(200, "x equals zero");
 }
 catch (e) {
     document.write(e.message);
 }

 // Output: x equals zero.

Remarks

The required exception argument can be any expression.