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/

From IRC (bridge bot)

@FromIRC

<Sankalp> Perhaps something like this: Digest::MD5.digest

<Sankalp> See this: https://crystal-lang.org/api/1.3.2/Digest/ClassMethods.html

<frojnd> Thank you

George Dietrich

@Blacksmoke16

frojnd: Digest::MD5.digest &.file(file_path)

From IRC (bridge bot)

@FromIRC

<frojnd> @Blacksmoke16 yes, it prints in bytes e.g.: => Bytes[60, 215, 160, 219, 118, 255, 157, 202, 72, 151, 158, 36, 195, 155, 64, 140] I need hex, so Digest::MD5.hexdigest(file) prints in hex: "3cd7a0db76ff9dca48979e24c39b408c"

<frojnd> Or just: Digest::MD5.hexdigest &.file("./bla.txt")

<frojnd> What's called &. after hexdigest?

George Dietrich

@Blacksmoke16

its the same as like Digest::MD5.hexdigest { |ctx| ctx.file "./bla.txt" }

From IRC (bridge bot)

@FromIRC

<frojnd> Ok

<frojnd> What's this called? Semanticlly?

George Dietrich

@Blacksmoke16

https://crystal-lang.org/reference/1.4/syntax_and_semantics/blocks_and_procs.html#short-one-parameter-syntax

From IRC (bridge bot)

@FromIRC

<frojnd> s/Semantically/semantically

<frojnd> Ah blocks and procs

<frojnd> While I'm here, What's the meaning of :: e.g. inside Digest::MD5

<frojnd> https://crystal-lang.org/api/1.3.2/Digest/MD5.html It says: Class Digest::MD5

George Dietrich

@Blacksmoke16

i dont think its ever explicitly called out anywhere, but its the same as ruby

tl;dr its the namespace separator. E.g. https://crystal-lang.org/reference/1.4/syntax_and_semantics/modules.html

From IRC (bridge bot)

@FromIRC

<frojnd> Thank you

From IRC (bridge bot)

@FromIRC

<Sankalp> frojnd: https://crystal-lang.org/reference/1.3/syntax_and_semantics/blocks_and_procs.html#short-one-parameter-syntax

Ramakrishnan Vasantha Gopal

@vgramkris

hi, is there any ways to check if a channel is empty w/o calling receive?

Hayden Jones

@wrq

https://carc.in/#/r/d3fx

with large enums, should crystal have a cap on trying to expand cases for exhaustive case?

It's trying to enumerate 308915776 cases here, just as an example

George Dietrich

@Blacksmoke16

@vgramkris i dont think there is. But could probably use select to handle the case where there is no value ready to be consumed. E.g. https://lbarasti.com/post/select_statement/#non-blocking-channel-operations

Ramakrishnan Vasantha Gopal

@vgramkris

thanks George, let me check that

claytoneast

@claytoneast

Hello, I have a type-narrowing question. I have the following code:

  tweets.each do |tweet|
    if tweet.referenced_tweets
      parent_tweet = tweet.referenced_tweets.first
      # do stuff
    end
  end

When I run crystal build, I get the following error:

271 | parent_tweet = tweet.referenced_tweets.first
                                              ^----
Error: undefined method 'first' for Nil (compile-time type is (Array(ReferencedTweet) | Nil))

I'm a little confused, since according to the crystal docs as I understand them here https://crystal-lang.org/reference/1.4/syntax_and_semantics/if_var.html, I've already ruled out the possibility of .referenced_tweets being nil by the check if tweets.referenced_tweets. I additionally tried with if !tweets.referenced_tweets.nil?, and I get the same problem.

What am I missing here?

George Dietrich

@Blacksmoke16

https://crystal-lang.org/reference/1.4/syntax_and_semantics/if_var.html#method-calls

tl;dr the 2nd half of that page :P

claytoneast

@claytoneast

:facepalm: wish I'd actually learned how to read. Thank you!!

Jonathan Silverman

@mixflame

How do I remove the dependency on Sqlite from the amber crystal heroku build?

George Dietrich

@Blacksmoke16

sqlite is a dep of the framework itself, (and so are the other two drivers for some reason?) so in short i dont think you can

related: amberframework/amber#1277

From IRC (bridge bot)

@FromIRC

<dukester> Noob here! Just installed crystal. created hello/cr for 45bytes. ran crystal build hello.cr and got hello for 1745560bytes

<dukester> Why so huge? Can it be trimmed down?

George Dietrich

@Blacksmoke16

add --no-debug

tl;dr its the stdlib

From IRC (bridge bot)

@FromIRC

<dukester> ok will do l8r

George Dietrich

@Blacksmoke16

you can override what is required by default, but its not really designed to be piecemilled

as there are a lot of interdependencies

https://github.com/crystal-lang/crystal/blob/master/src/prelude.cr

From IRC (bridge bot)

@FromIRC

<dukester> re-compiled! now 1441272bytes. better but not great.

George Dietrich

@Blacksmoke16

:shrug: is what it is. its not really that big either

From IRC (bridge bot)

@FromIRC

<dukester> ok thanks!

George Dietrich

@Blacksmoke16

also checkout https://forum.crystal-lang.org/t/baseline-content-of-a-compiled-executable/1504

From IRC (bridge bot)

@FromIRC

<dukester> re-compiled hello.cr and used --release --no-debug. trimmed hello to 491960. Much better! I may like this lang after all. :⁠)

George Dietrich

@Blacksmoke16

could prob get a bit more via strip ./hello

but yea, as called out in that thread, its not really a big deal the majority of the time

From IRC (bridge bot)

@FromIRC

<dukester> I'll try it.

<dukester> after strip = 426264. I'm happy. Thx ...

George Dietrich

@Blacksmoke16

:thumbsup:

From IRC (bridge bot)

@FromIRC

<dukester> l8r

Where communities thrive

People

Repo info

Activity