Streams are event emitters of course. Change your example to '.on('data',
function (prime)' and you have a stream. In this case there is only one
kind of event (and no 'end'!), so using a stream would let you pipe and
other streamy stuff.
Steve
On Fri, Apr 27, 2012 at 9:13 PM, Nathan Rajlich <nat...@tootallnate.net>wrote:
> For times when a callback will be invoked multiple times, it's better to
> use an EventEmitter:
>
> primeGenerator.on('prime', function (prime) {
> // do stuff with num
> });
>
> This allows other interested parties to be able to get the data as well.
>
>
> On Fri, Apr 27, 2012 at 7:09 PM, Mark Volkmann
> <r.mark.volkm...@gmail.com>wrote:
>
>> Suppose though that it's a long-running operation that may or may not
>> involve I/O. Both approaches would work. Is there a clear bias toward
>> streams?
>>
>> ---
>> R. Mark Volkmann
>> Object Computing, Inc.
>>
>> On Apr 27, 2012, at 8:45 PM, Tim Caswell <t...@creationix.com> wrote:
>>
>> Since it's a sync operation, I'm assuming no threading tricks, then the
>> question is sync callback vs buffering. Sync callback has more more
>> overhead since it's many more function calls, but buffering has it's
>> drawbacks if you're not going to need all the answers at once.
>>
>> // buffering
>> var primes = getPrimes(n)
>>
>> // iterator
>> getPrimes(n, function (prime) {
>> });
>>
>> On Fri, Apr 27, 2012 at 8:27 PM, Steve Molitor <stevemoli...@gmail.com>wrote:
>>
>>> Interesting question! I'm looking forward to the answer.
>>>
>>> Both streams and callbacks usually involve IO, but calculating prime
>>> number would not. So it might be a special case. But still interesting.
>>>
>>> Steve
>>>
>>>
>>> On Fri, Apr 27, 2012 at 8:22 PM, Mark Volkmann <
>>> r.mark.volkm...@gmail.com> wrote:
>>>
>>>> This is a question about recommended usage in Node.
>>>> As an example, let's say I want to write a function that returns the
>>>> first n prime numbers.
>>>> I could write a function that takes n and a callback.
>>>> It could invoke the callback once for each prime number to be returned
>>>> and then invoke it with zero to signal the end.
>>>>
>>>> I could also write a function that takes n and returns a readable
>>>> stream.
>>>> The caller could listen for data events (one per prime number to be
>>>> returned)
>>>> and an end event.
>>>>
>>>> I'm pretty sure the stream approach is preferred,
>>>> but would you say that the callback approach is wrong or at least
>>>> discouraged?
>>>>
>>>> --
>>>> R. Mark Volkmann
>>>> Object Computing, Inc.
>>>>
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