[dojo-contributors] Stance on custom error types

Bryan Forbes bryan at reigndropsfall.net
Mon Jun 4 11:36:25 EDT 2012


As long as we're subclassing properly, I'd rather use custom error types.

http://blog.getify.com/howto-custom-error-types-in-javascript/


Mark Wubben wrote:
> Dojo seems to do custom errors by adding a `dojoType` property to the error instance. Examples in `dojo/request` and `dojo/io`. The new Promise code however uses a subclassed Error.
> 
> dojo/promise/CancelError:
> 
> 	function CancelError(message){
> 		Error.captureStackTrace && Error.captureStackTrace(this, CancelError);
> 		this.message = message || "The deferred was cancelled.";
> 		this.name = "CancelError";
> 	};
> 	CancelError.prototype = new Error;
> 	CancelError.prototype.constructor = CancelError;
> 	return CancelError;
> 
> I prefer subclassed errors because they're easier to instantiate and test for (either using `instanceof` or checking their `name`). We could even add `dojoType` properties.
> 
> What is your preference?
> 
> In any case, we need to standardize these across the codebase.
> 
> --
> Mark Wubben
> 
> http://novemberborn.net
> http://twitter.com/novemberborn
> 
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-- 
Bryan Forbes
http://www.reigndropsfall.net

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