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 <[email protected]>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
> <[email protected]>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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