Re: apply madness
Vectors are eager. So they'd need to be finite. Varargs/rest args can be infinite lazy sequences. So it is appropriate that they are just generic "seq" abstractions instead of something specific (and eager) like a vector. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com 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 clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: apply madness
On Thursday, May 12, 2016 at 4:10:39 AM UTC-4, Michael Gardner wrote:
>
> There's no need to avoid `apply` altogether, IMO. You could do something
> like this:
>
> (let [raw (list :a 1 :b 2 :c 3)]
> (into {:raw raw}
> (filter (comp even? second)
> (apply hash-map raw
>
Ah, that comp is nice. I'll use that.
>
> BTW, `list` is pretty uncommon. Usually you'd just use a vector literal.
>
Understood, but I am actually working on a function where the values
originate as a & rest param.
Hmm, given the oddness of lists in Clojure, I wonder why those aren't
vectors.
Thx! -kt
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Re: apply madness
On Thursday, May 12, 2016 at 3:59:10 AM UTC-4, dennis wrote:
>
> A try:
>
> (let [raw (list :a 1 :b 2 :c 3)]
> (->> raw
>(partition 2)
>(filter #(even? (second %)))
>(map vec)
>(into {})
>(merge {:raw raw})))
>
> => {:b 2, :raw (:a 1 :b 2 :c 3)}
>
Brilliant. Actually, I had my own spec wrong. Adjusting for that:
(let [raw (list :a 1 :b 2 :c 3 :d 42)]
> (merge {:cz (->> raw
>(partition 2)
>(filter #(even? (second %)))
>(map vec)
>(into {}))}
> (->> raw
> (partition 2)
> (map (fn [[k v]] (vector k (when-not (even? v) v
> (into {}
> ;; => {:cz {:b 2, :d 42}, :a 1, :b nil, :c 3, :d nil}
ie, I want the :cz (formerly :raw) key to hold a selective map of the
inputs, and then all the inputs as key-values but with some values cleared.
Further repairs welcome.
Thx! -kt
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Re: apply madness
There's no need to avoid `apply` altogether, IMO. You could do something like
this:
(let [raw (list :a 1 :b 2 :c 3)]
(into {:raw raw}
(filter (comp even? second)
(apply hash-map raw
BTW, `list` is pretty uncommon. Usually you'd just use a vector literal.
And this is the right place to ask!
> On May 12, 2016, at 00:46, hiskennyness wrote:
>
> This does what I want but feels nooby-ish, as in "in a month I will do this
> without APPLY":
>
> (let [raw (list :a 1 :b 2 :c 3)]
> (apply assoc {}
> :raw raw
> (apply concat
>(filter #(even? (second %))
>(apply hash-map raw)
> ;; => {:raw (:a 1 :b 2 :c 3), :b 2}
>
> Am I being too hard on myself?
>
> Meta question: is there a better place to ask such questions?
>
> -kt
>
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Re: apply madness
A try:
(let [raw (list :a 1 :b 2 :c 3)]
(->> raw
(partition 2)
(filter #(even? (second %)))
(map vec)
(into {})
(merge {:raw raw})))
=> {:b 2, :raw (:a 1 :b 2 :c 3)}
2016-05-12 15:46 GMT+08:00 hiskennyness :
> This does what I want but feels nooby-ish, as in "in a month I will do
> this without APPLY":
>
> (let [raw (list :a 1 :b 2 :c 3)]
>> (apply assoc {}
>> :raw raw
>> (apply concat
>>(filter #(even? (second %))
>>(apply hash-map raw)
>> ;; => {:raw (:a 1 :b 2 :c 3), :b 2}
>
>
> Am I being too hard on myself?
>
> Meta question: is there a better place to ask such questions?
>
> -kt
>
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apply madness
This does what I want but feels nooby-ish, as in "in a month I will do this
without APPLY":
(let [raw (list :a 1 :b 2 :c 3)]
> (apply assoc {}
> :raw raw
> (apply concat
>(filter #(even? (second %))
>(apply hash-map raw)
> ;; => {:raw (:a 1 :b 2 :c 3), :b 2}
Am I being too hard on myself?
Meta question: is there a better place to ask such questions?
-kt
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