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This fails in the case m = new InvalidInputError(); dontThrowMeYet(m);
– Eric
Commented Sep 6, 2014 at 12:50
@Eric I agree, but this seems like a pretty small limitation. I've never needed to instantiate an exception object ahead of time (excepting meta-programming uses like my code sample above). Is this really an issue for you?
– Jonathan Benn
Commented Oct 6, 2014 at 19:21
Yes, the behaviour seems to be the same, so I will change my answer. I'm not 100% satisfied with the stack trace, which brings you to the "var error" line on Firefox and Chrome
– Jonathan Benn
Commented Oct 29, 2014 at 17:31
1

@JonathanBenn I'm real late to the party, so maybe you've already picked this up. I frequently instantiate an exception object when I use asynchronous programming and Promises. Following @Eric's names, I often use m = new ... then Promise.reject(m). It's no necessity, but the code is easier to read.
– BaldEagle
Commented Nov 21, 2016 at 19:45
2

@JonathanBenn: (he he) in Oct 14, you seemed to think instantiating an exception object before throwing it would be rare. I gave an example of one time I do it. I won't say it's common, but it's handy to have when I want it. And, my code is more readable because the instantiating is all on one line and the rejecting all on another. I hope that does it!
– BaldEagle
Commented Dec 5, 2016 at 2:10

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like so
```
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```python
def function(foo):
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```
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