I really like the as-> macro for this kind of thing.
(as-> (something) x
(if (test1 x) (transform1 x) x)
(if (test2 x) (transform2 x) x)
(do-something-else-with x y)
(if (test3 x) (transform3 x) x))
Advantages:
- It's part of core in 1.5
- It's a macro and compiles down to efficient code
- You can easily mix in other kinds of transforms (as demonstrated above)
I also wrote a variant of this in my clojure-utils library that is very
useful: the "and-as->" macro does exactly the same thing but bails out
early if it finds a false or nil value. This turns out to be extremely
useful for state-transformer type algorithms where you need to backtrack if
a step doesn't succeed.
On Friday, 5 July 2013 13:13:05 UTC+1, Laurent PETIT wrote:
>
> hello,
>
> More often than not, I'm facing code looking like this:
>
> (let [x (if (test1 x) (transform1 x) x)
> x (if (test2 x) (transform2 x) x)
> x (if (test3 x) (transform3 x) x)]
> x)
>
> Do you know of a better way to write this with only clojure.core
> functions?
>
> So far, I've had no success with cond->, as->, etc.
>
--
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to [email protected]
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
---
You received this message because you are subscribed to the Google Groups
"Clojure" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/groups/opt_out.
