I can't speak for the core.async implementers, of course, but I've been 
working on a similar library for Javascript, and had to realised that not 
all sequence operations make sense, or are even possible in the context of 
channels.

The one you mentioned, take-while, is a good example. Once you've taken the 
first item from the channel that does not satisfy the predicate, there is 
no way to put it back without breaking the abstraction. So I think the best 
one could do in order not to lose any data is implement something like a 
'take-until' that produces all elements of the channel up until the first 
one that satisfies a given predicate.

Cheers,
Olaf


On Monday, 27 January 2014 02:53:55 UTC+11, Daniel Solano Gómez wrote:
>
> Hello, all, 
>
> I have just started using core.async, and I was curious as to why 
> particular sequence functions where chosen to be implemented.  For 
> example, there is take, but no take-while or drop.  Is this a deliberate 
> design decision? 
>
> Thanks for the great library! 
>
> Sincerely, 
>
> Daniel 
>

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