The parameter order of as-> makes it convenient to use *inside *-> so you
can name the threaded parameter only where it needs naming:
(-> "UFOT"
(reverse)
(->> (apply str))
(string/lower-case)
(as-> x (string/replace "slip on a tofu" x "banana peel")))
On Friday, August 28, 2015 at 6:51:44 PM UTC-4, Alan Thompson wrote:
>
> 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]
> <javascript:>> wrote:
>
>> Good one!
>>
>> On Fri, Aug 28, 2015 at 6:34 PM, Moe Aboulkheir <[email protected]
>> <javascript:>> 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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>
>
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