On Fri, Dec 27, 2013 at 11:03 AM, Gary Trakhman <[email protected]>wrote:
> Why should functions share information?
>
Maybe I'm the odd one out, but every project I've done has at least a few
bits of info shared by many functions. It might be something like
BUFFERSIZE or NUM-THREADS or DATABASE_URL. Basically, they are things I
expect to be unchanged. I separate it out as a var so that I don't have to
repeat the number 30268 everywhere, and I can easily change it for the
whole project if necessary. In the initial design, nothing suggests to me
that {:buffer-size, :number-threads, :database-url} is some data structure
that I should be explicitly passing around and destructuring in all my
functions, just in case some day I decide I want to configurations to exist
simulatenously.
Can we create a path that makes it easier to get from the version where we
expect things to be unchanged to the version where we need to support
multiple configurations?
> Vars are easy, but wrong at times, thus the tension. Is there something
> in between the purity and the ease?
>
Exactly.
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