Coffeescript: Break out of a forEach loop [duplicate]

Question

Possible Duplicate:
Javascript Array.forEach HowTo break?

Given that I have a forEach loop, how do I break out of that loop in case X is true?

For example:

user.forEach (x,i) ->

                    if x.status == "available"
                        -- I want to break here -

Thanks

THis is actually covered here: stackoverflow.com/questions/2641347/… — Charlie Martin
– Charlie Martin, Commented Oct 17, 2011 at 3:34

Charlie Martin · Accepted Answer · 2011-10-17 03:36:07Z

12

Basically, don't. forEach is meant to be essentially "functional". You could break it with an exception, but exceptions should be used for "exceptional" conditions, not control flow.

If you mean to break, you don't mean a functional form, you mean an iteration. Use a for loop.

answered Oct 17, 2011 at 3:36

Charlie Martin

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5 Comments

Trevor Burnham Over a year ago

Or, alternatively, use something like jQuery's $.each, which will break if you return false.

user24359 Over a year ago

I agree with this, but I'm not sure the word "functional" is right, even in scare quotes; the whole point of forEach is to create side effects.

Charlie Martin Over a year ago

Isaac, compare forEach with, eg, map, with the loop body as a closure.

user24359 Over a year ago

Sure, you can create side effects with map by modifying your enclosed variables, but that's using it non-functionally.

Charlie Martin Over a year ago

And you can do things in a forEach that don't have side-effects.

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