#ocaml on 2020-04-25 — irc logs at freenode.irclog.whitequark.org

2019-09-26 12:04 adrien changed the topic of #ocaml to: Discussions about the OCaml programming language | http://www.ocaml.org | OCaml 4.09 release notes: https://caml.inria.fr/pub/distrib/ocaml-4.09/notes/Changes | Try OCaml in your browser: http://try.ocamlpro.com | Public channel logs at http://irclog.whitequark.org/ocaml

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20:21 <ArthurStrong> Hi all. What is the easiest way just to print structure, like "print" in Python?

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20:40 <labor[m]> There is no simple way. You can use a ppx for that.

20:40 <ArthurStrong> labor[m]: why? It's because OCaml is strongly typed?

20:41 <labor[m]> Because it's statically typed. Types are not known at run time.

20:42 <ArthurStrong> OK

20:43 <ArthurStrong> 2nd question. I want to split a list using predicate. Say, list of strings: "0", "a", "1", "b"... predicate: isnumber? output=[["0", "a"], ["1", "b"]...

20:43 <ArthurStrong> Is there something ready?

20:44 <ArthurStrong> I mean, predicate shows beginning of a sublist

20:45 <labor[m]> Here's one ppx: https://github.com/ocaml-ppx/ppx_deriving/blob/master/README.md#plugin-show

20:46 <labor[m]> I'm not sure I understand what you want to do.

20:46 <ArthurStrong> labor[m]: I have a text file

20:46 <ArthurStrong> it's a dump of some blog

20:47 <ArthurStrong> each part started with date

20:47 <ArthurStrong> so I want to use a predicate like "is date?"

20:47 <ArthurStrong> and to split this file into blog posts

20:47 <ArthurStrong> a predicate would be regexp matcher

20:51 <labor[m]> Have you started to write something, like, opening and reading the file ?

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20:52 <ArthurStrong> labor[m]: yes, I'm getting a file as a list of strings

20:52 <labor[m]> Each string correspond to one blog entry ?

20:52 <ArthurStrong> labor[m]: no

20:53 <ArthurStrong> ah, nevermind

20:53 <labor[m]> ?

20:54 <ArthurStrong> https://pastebin.com/KG8N30WL

20:54 <ArthurStrong> this is a text I have

20:54 <ArthurStrong> I want to split it by sublists

20:54 <ArthurStrong> each started with "* date"

20:54 <labor[m]> OK, then you could do something like:

20:56 <labor[m]> List.fold_left (fun (curr_date, curr_content, entries) line -> ...) ... yourlistofstrings

20:57 <ArthurStrong> OK

20:57 <labor[m]> You just have to fill the two `...` parts

20:57 <ArthurStrong> Is there a standard function that returns index of element in list to be found? Instead of the element

20:59 <labor[m]> No but that's probably not what you whant

20:59 <ArthurStrong> OK, thanks!

20:59 <labor[m]> Why do you want to do this ?

21:00 <ArthurStrong> to implement my own version of the function that splits

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21:03 <octachron> There is List.partition that splits a list according to a predicate

21:04 <labor[m]> Yep but that's not what he means when he says "split" if I got it

21:07 <octachron> Ah yes. But it is indeed better to write a simple fold rather than use indices.

21:07 <octachron> Indices are a sign that you are using a List as an Array.

21:08 <ArthurStrong> octachron: OK, thanks for the hint

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22:50 <ArthurStrong> What is the difference between raise and failwith?

22:50 <ArthurStrong> failwith is like die()?

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23:11 <ArthurStrong> also, how to do a sequential let, like let* in Scheme/

23:11 <ArthurStrong> ?

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23:12 <companion_cube> `failwith s` is just `raise (Failure s)`

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23:12 <companion_cube> ArthurStrong: not sure what you mean by sequential let

23:12 <companion_cube> `let x= 1 in let y=2 in …` is already sequential

23:13 <ArthurStrong> aha, thanks!

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