# throw statement

Source: https://ref.dm-lang.org/proc/throw

### Format
> `throw Value`

### Args
> Value: Any value, which will be sent to catch() if present.

This keyword throws an exception, which will stop executing the current proc and go to the most recent catch block if one is present. The catch block will receive the thrown value. If there is no try/catch in use, the exception will be passed to `world.Error()` (if present), then the current proc will end and control will return to the caller.

```dm
try
  if(!src.ready) throw EXCEPTION("Not ready")
  DoSomething()
catch(var/e)
  world.log << "Exception: [e]"
```

You can use the `EXCEPTION` macro to create a new `/exception` datum, which contains a value or message as well as the file and line number where the exception was created. The thrown value does not have to be an `/exception` datum; you can throw anything, even null.

### See also
- [try statement](https://ref.dm-lang.org/proc/try.md)
- [Error proc (world)](https://ref.dm-lang.org/world/proc/Error.md)
- [EXCEPTION proc](https://ref.dm-lang.org/proc/EXCEPTION.md)
- [exception](https://ref.dm-lang.org/exception.md)