Because forEach uses a function to call back, but is not asynchronous. A
function not doing I/O can choose when it calls your function.
forEach takes the easy path and just calls its callback in a loop one after
another.
Angelo Chen <angelochen...@gmail.com> wrote:
>one confusing thing for newbies like me:
>
>exports.get_list = function ( cb) {
> rclient.smembers("list", function(err, members) {
> members.forEach(function(member){
> console.log(member)
> })
> cb(null, 'lst')
> })
>}
>
>the function(member) for 'forEach' is callback, right? then why,
>cb(null,'lst') will wait until the loop is over?
>
>
>
>On Mar 20, 5:18 pm, Oliver Leics <oliver.le...@gmail.com> wrote:
>> On Tue, Mar 20, 2012 at 8:47 AM, Bruno Jouhier <bjouh...@gmail.com> wrote:
>>
>> > var next_id = rclient.incr("next_id", _);
>>
>> > This code is asynchronous. And the underscore marker indicates where the
>> > code may yield. So nothing's hidden and the execution model is the same as
>> > with async callbacks: non blocking, single threaded event loop, non
>> > preemptive.
>>
>> The underscore "_" in the above example IS the callback, so it is
>> still using callbacks. It is only abstracting them away.
>
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