crystal-lang/crystal

The Crystal programming language | http://crystal-lang.org | Fund Crystal's development: http://is.gd/X7PRtI | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/

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@FromIRC

<SamantazFox_> I'll see that tomorrow. I'mm too tipsy to do anything rn x)

ddd

@Dan-Do

what's the short syntax to convert Slice(UInt32) to Slice(UInt8)?

Here is mine

size = 100
sl = Slice(UInt32).new(size)
sl.to_unsafe.as(UInt8*).to_slice(size * sizeof(UInt32))

oprypin

@oprypin:matrix.org

[m]

@Dan-Do: convert in what sense? not obvious. could be truncating each number, could be splitting low-endian or big-endian

@Dan-Do: also might be a different answer if this this happens to be UTF-32

if you're looking for "system-endian" then your answer is good

ddd

@Dan-Do

I have an array of UInt32, I want to compress it using snappy which input only accepts Slice(UInt8)

Quinton Miller

@HertzDevil

crystal-lang/crystal#11379

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@FromIRC

<riza> since an iterator#next returns (T || Iterator::Stop) -- is there a pretty way to sanitize that Stop type out of the return values type?

<riza> or does it have to be a case statment

<riza> I'm having an awful time attempting to increment two iterators at once

George Dietrich

@Blacksmoke16

Case or if with is_a should do it

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@FromIRC

<riza> case fails me because I have two iterators I need to mutually advance

<riza> this is what I tried, anyway: case ; when a === stop || b === stop ; else ... end

<riza> I'm also noticing tonight that ranges can't be decreasing and I'm a little twinging at that too

George Dietrich

@Blacksmoke16

I'd just use the latter approach then

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@FromIRC

<riza> I think I'm just going to abandon iterators entirely and twiddle the bits myself

<riza> I was surprised about the decreasing range but that's what ruby does too so there must be some sort of reason

Ary Borenszweig

@asterite

riza: maybe zip the iterators? ;-)

And for decreasing Iterator you can do x.to(y)

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@FromIRC

<xyhuvud> I have a small idea of what riza may be fiddling with :⁠D

Ary Borenszweig

@asterite

Haha, me too :-)

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@FromIRC

<xyhuvud> todays exercise was so easy and short the top list server crashed due to load :X

Ary Borenszweig

@asterite

Really? That's great news. I guess I'll be streaming for just a few minutes then. I think Eric puts an easy exercise after a tough one (yesterday wasn't that hard, but you needed to think about a different way to represent things)

ddd

@Dan-Do

How can I tell crystal build to use a single "header only" (.h without .c)?

ddd

@Dan-Do

I made a fake.c

# include "header.h"

But after compiled with gcc -c ... the object file removed two functions. Weird!

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@FromIRC

<riza> @asterite oh, great suggestion, thank you

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@FromIRC

<holst> I have a couple of observations: Crystal lang needs something that is taggable and searchable; crystal lang is not. crlang vs. #crlang is great ;⁠-)

<holst> Also, I think the Goals of the project are non-orthogonal. In total 6 goals but they can be reduced down to at least 5 or even 4 if we accept the fact that OOP is not a goal in itself

<holst> Have anyone written a good JSON / microservice tutorial for crlang? I think I am struggling a lot with moving from say Python or Javascript to Crlang due to the parsing and typing requirements. I have been looking for some kind of best practice guide for this but I have not found one

<holst> do we really need to define the complete API response univerise in the client application just to "get some job done"? If so it puts a great barrier to writing small client apps that uses a big server API

<holst> case in mind: docker engine API

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@FromIRC

<holst> and kubernetes API

<straight-shoota> What do you mean with "complete API response univerise"?

<holst> the generated APIs are completely terrible, 100K LOC monsters

<straight-shoota> What generated APIs? Who generated them and why?

<holst> say you do docker inspect <container> there might be a lot of data in there which is mostly useles to the application that did the query.

<holst> @straight-shoota: the generated APIs are by the project maintainers (obviously not generated for crystal)

<straight-shoota> I don't follow what your asking about

<straight-shoota> I believe you have assumed some implicit context, but it does not communicate

<holst> https://pastebin.com/fV4MBCB7

<holst> thats the complete output for a docker inspect

<straight-shoota> yes, I got that. Still don't know what your problem is

<holst> If I were to implement a complete class description for the entire response I would just not use crlang for that

<straight-shoota> y not?

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@FromIRC

<holst> Useless work. I do not have any need for the code that talks about the Network parameters say. So why would I write code for it

George Dietrich

@Blacksmoke16

could also just use JSON.parse ofc. then you have to deal with typing in a more painful to use way like data.as_a[0].as_h["Id"].as_s versus data[0].id

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@FromIRC

<holst> I would prefer if I could work with a dynamic type instead to at least dig myself down to the part that I am interested in

George Dietrich

@Blacksmoke16

fwiw you dont need to add properties and stuff for things you wont need

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