>> ```javascript
>> function CustomError(message) {
>>    this.message = message || '';
>> }
>> CustomError.prototype = new Error;
>>
>> // whenever you need
>> throw new CustomError;
>> ```
>
> At best, this will not preserve the stack trace property, at worse this will lead to a bad one.

Because the location info will be that of the "new Error"? One could
try this instead, which seems to work for me:

throw { __proto__ : new Error(), reason: "Monday" }

Claus

> At best, this will not preserve the stack trace property, at worse this will lead to a bad one.

Because the location info will be that of the `new Error`? One could
try this instead, which seems to work for me:

```js
throw { __proto__ : new Error(), reason: "Monday" }
```