Hi all,
I have asked this question of the issues page of the coffee-script account on
github. However, I believe it is also relevant to the node.js community.
I am trying to understand callbacks within for loops. Suppose I have two
methods mth1 and mth2 as follows:
mth1: (item, callback) ->
callback null, item
mth2: (my_array, cb) ->
for my_item in my_array
@mth1 my_item, (error, result) =>
if error?
cb error, null
cb null, "done"
I have noticed that this code binds the last my_item to all the function (mth1)
calls. Is that the normal behavior? Is there something I forgot to do?
I also have a couple more questions regarding callbacks within loops. Consider
the following code:
class CB_test
constructor:
# constructor code goes here
# Just an ordinary method
another_method: (item, cb) ->
cb null, item
outer_method: (my_array, callback) ->
@inner_method my_item, callback for my_item in my_array
callback null, "Outer method completed"
inner_method:(my_item, cb1) ->
@another_method my_item, (error, result) =>
if error?
cb1 error, null
Obviously, what I wanna do here is similar to the previous case, but with a
correct binding. However, if an error occurs ininner_method, cb1 error, null
will be called first, and then callback null, Outer method completed will be
called. How do I circumvent that? Any thought?
Thanks in advance
José
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