"Code is data" comes up in Clojure less than newcomers might expect. As a rule
of thumb, it should be the last tool you reach for, as it's easier to work with
data structures that have a simpler and more constrained syntax.
It's often hard to give good advice when context is lacking, but if you have a
grid, and want to supply a sequence of instructions to modify it, and you want
to inspect and manipulate those instructions, then I'd suggest something like:
(transform
(grid 10 10)
[[:toggle 2 3 4 5]
[:off 2 3 4 5]
[:on 2 3 4 5]])
On Sun, 18 Jul 2021, at 5:40 PM, SideStep wrote:
> Thanks Tania! The point I'm making is that list (data structure for
> evaluatable data/code) is not easily manipulatable with code in clojure. So
> much for 'code-is-data'...
> Thanks for the suggestion.
> In regards to rethinking it: it is supposed to be commands coming-in that
> sets parts of the grid with on/off/toggle... I want to append those commands
> (code) as data to the representation of a grid and evaluate the list of
> commands to get the final state of the grid.
> Trying to embrace this code-is-data thing here.
> On Saturday, July 17, 2021 at 9:21:29 PM UTC+2 [email protected] wrote:
>>
>> Hi,
>>
>> conj <https://clojuredocs.org/clojure.core/conj> adds at the end of a
>> vector, but at the beginning of a list. It is how it is implemented. I think
>> this
>> <https://stackoverflow.com/questions/5734435/put-an-element-to-the-tail-of-a-collection>
>> and this
>> <https://medium.com/@greg_63957/conj-cons-concat-oh-my-1398a2981eab> sums it
>> up why.
>>
>> You could achieve what you want by using concat
>> <https://clojuredocs.org/clojure.core/concat> (note this returns a LazySeq):
>> `user=> (concat grid '((off 1 2 3 6)))
>> (-> (grid 10 10) (toggle 2 3 4 5) (off 2 3 4 5) (on 2 3 4 5) (off 1 2 3 6))`
>> Though I'm not exactly sure what is the end goal of this but I'd rethink the
>> way it is done.
>>
>>
>>
>>
>> On Sat, 17 Jul 2021 at 14:24, SideStep <[email protected]> wrote:
>>>
>>> ____ <https://stackoverflow.com/posts/68420449/timeline>
>>>
>>> I have a representation of a matrix in grid.clj file:
>>>
>>> `(-> (grid 10 10)
>>> (toggle 2 3 4 5)
>>> (off 2 3 4 5)
>>> (on 2 3 4 5))
`
>>>
>>> It's a list of functionts, first one initializes a grid, others modify it.
>>> Clojures' 'code is data' supposed to make it easy for me to modify that
>>> representation by adding an instrucion at the *end* of collection. List is
>>> an ordered collection right? Order matters. How do I add an instruction to
>>> the end of the list then?
>>> Something like this:
>>>
>>> `(def grid (read-string (slurp "grid.clj")))
>>> (conj grid '(off 1 2 3 6))
`
>>> Yet I can't add to the end of the list, which is a data structure that is
>>> evaluatable as code. How is it 'code as data' if I can't add to the end of
>>> the ordered collection that is meant for code (as data)?
>>>
>>>
>>>
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>
>
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--
James Reeves
booleanknot.com
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