Web Reference: Aug 7, 2023 · JavaScript allows to use throw with any argument, so technically our custom error classes don’t need to inherit from Error. But if we inherit, then it becomes possible to use obj instanceof Error to identify error objects. Jul 8, 2025 · The throw statement throws a user-defined exception. Execution of the current function will stop (the statements after throw won't be executed), and control will be passed to the first catch block in the call stack. If you throw an object, it looks kind of off, and the final one is just an average error. This method creates an error with a custom name while preserving stack tracing:
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