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 <akhil.wali...@gmail.com> wrote:
> Good one!
>
> On Fri, Aug 28, 2015 at 6:34 PM, Moe Aboulkheir <m...@nervous.io> 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
>
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