#crystal-lang on 2016-12-31 — irc logs at freenode.irclog.whitequark.org

2016-12-24 17:51 ChanServ changed the topic of #crystal-lang to: The Crystal programming language | http://crystal-lang.org | Crystal 0.20.3 | Fund Crystal's development: http://is.gd/X7PRtI | Paste > 3 lines of text to https://gist.github.com | GH: https://github.com/crystal-lang/crystal | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/ | Logs: http://irclog.whitequark.org/crystal-lang

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01:50 <FromGitter> <firejox> well, I have write a thread safe channel in my lib :) ⏎ https://github.com/firejox/crystal-async_await

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01:53 <FromGitter> <firejox> though they are in different design

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15:12 <FromGitter> <maiha_twitter> Happy new year! (JST)

15:17 <literal> how do I create a hash whose values are of varying types? tried without much luck: https://gist.github.com/hinrik/f7ddc49b7d7b6a3cd465b0fd8e09e792

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15:38 <RX14> literal, like this: https://carc.in/#/r/1ih4

15:38 <Papierkorb> literal: Hash(String, Int32 | String).new == {} of String => Int32|String

15:40 <RX14> as you can see it's a gigantic pain in the ass, so don't do it

15:40 <RX14> well i mean for recusrive types

15:40 <Papierkorb> Ah you wanted a recursive hash, sorry

15:42 <RX14> in crystal we tend to use a class/struct instead of using hashes as generic data bags

15:42 <literal> yeah, I only have a fixed amount of 3 keys in the top level hash, so I just made them 3 separate variables

15:42 <literal> makes sense

15:42 <RX14> hashes are used mainly for key -> value mappings only where the values are a known type

15:42 <RX14> which can of course be a union

15:49 <literal> how about this? https://gist.github.com/hinrik/eb9f28d7bfe2be521beede2c3f948fcc

15:54 <RX14> you could change the default hash value to be 0

15:55 <RX14> or you could do hash[key] = (hash[key]? || 0) + 1

15:59 <literal> ah, nice

15:59 <RX14> or actually

16:00 <RX14> hash.fetch(key, 0) works too i think

16:00 <RX14> for key or 0

16:00 <RX14> yup

16:00 <RX14> Hash#fetch(key, default)

16:01 <literal> that'll work

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18:08 <Kug3lis> where I can find old ruby based compiler source code? :D

18:09 <RX14> there's a branch

18:09 <RX14> but it's really old

18:10 <RX14> i lied, it's a tag

18:10 <RX14> called ruby

18:10 <Kug3lis> yeah I know, I am just curious how it looks

18:11 <RX14> https://github.com/crystal-lang/crystal/tree/ruby

18:11 <Kug3lis> thanks :)

18:11 <Kug3lis> new year in front of pc? D:

18:12 <RX14> yes

18:12 <RX14> practicing for an exam even

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18:13 <Kug3lis> those jan 2 exams are crazy :D

18:15 <RX14> yeah

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18:38 <Kug3lis> Could someone explain me why sometimes there are in class def self.new() and def initialize() ?

18:38 <Kug3lis> isnt it the same?

18:38 <RX14> no

18:38 <RX14> initialize runs in the new class instance

18:39 <RX14> self.new runs at the class level

18:39 <RX14> self.new is mostly used for passing to another definition of `new`

18:39 <BlaXpirit> Kug3lis, they both serve a very similar purpose but have different advantages

18:39 <Kug3lis> ahh ok

18:39 <BlaXpirit> you can initialize fields only in "initialize"

18:40 <BlaXpirit> you can pass through to a different constructor only in "new"

18:40 <Kug3lis> and new basically overloads different arguments for initialize?

18:40 <BlaXpirit> something like that. but technically that sounds wrong

18:40 <BlaXpirit> it's the other way around maybe

18:41 <Kug3lis> because I was looking at Http::Server and did not much understand thats difference

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