@jmar
It's safe to say that you want both to treat the multiple callbacks as a
bug, yet still handle the situation gracefully. In that vein, I agree that
using once will only silence the problem in a bad way while protecting your
application code. The goal is to have both: a warning / error and
protection.
Again, add this manner of protection to your control-flow lib and forget
about it.
Cheers,
Adam
On Fri, Oct 4, 2013 at 8:58 AM, Michael Jackson <mjijack...@gmail.com>wrote:
> The solution to this problem is very straightforward using promises,
> assuming you only want the result from the first time the callback is
> invoked. For example, using the when library (most promise libraries will
> give you a similar deferred API):
>
> var when = require('when');
>
> function doSomethingAsync() {
> var deferred = when.defer();
>
> misbehavingAsyncApi(function (error, result) {
> if (error) {
> deferred.reject(error);
> } else {
> deferred.resolve(result);
> }
> });
>
> return deferred.promise;
> }
>
> doSomethingAsync().then(function (result) {
> // You'll only ever get here once, even if the callback you gave
> // to misbehavingAsyncApi is called multiple times.
> });
>
> Due to the nature of promises, they will only ever be fulfilled once.
> Callbacks don't give you that same guarantee, which is why they're a pretty
> poor substitute for a return statement.
>
> Good luck!
>
> --
> Michael Jackson
> @mjackson
>
>
> On Mon, Sep 30, 2013 at 10:17 PM, jeevan kk <jeeva...@gmail.com> wrote:
>
>> I am using different 3rd party modules in my project. I have seen, in
>> some odd situations the 3rd party module which I am using is calling the
>> callback multiple times.
>>
>> Is there any general approach which I can follow so avoid such
>> situations.
>>
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than much gain with injustice.
Proverbs 16:8
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