I have become very partial to a simple adaptation of as-> from the Tupelo
Core <https://github.com/cloojure/tupelo> library. I almost always like to
be explicit about the location the previous value, since either -> or ->>
can sometimes be difficult if the threading forms don't always want the arg
as the first or last parameter. Copying the pattern of Groovy/Ruby, I
almost always name the threading placeholder "it". Since I don't like
repetition (& I would argue that the as-> form has its params backwards!) I
created the simple it-> form:
(defmacro it->
"A threading macro like as-> that always uses the symbol 'it' as the
placeholder for the next threaded value:
(it-> 1
(inc it)
(+ it 3)
(/ 10 it))
;=> 2
"
[expr & forms]
`(let [~'it ~expr
~@(interleave (repeat 'it) forms)
]
~'it ))
Alan
On Fri, Aug 28, 2015 at 6:14 AM, Akhil Wali <[email protected]> wrote:
> Good one!
>
> On Fri, Aug 28, 2015 at 6:34 PM, Moe Aboulkheir <[email protected]> wrote:
>
>> The function is actually shorter without cond->: (conj (if first? args
>> (vec args)) x)
>
>
>
>
>
> --
> Akhil Wali
>
> # https://github.com/darth10
> # https://darth10.github.io
>
> --
> 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/d/optout.
>
--
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/d/optout.
