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

<Papierkorb_> While possible, I'd prefer an "official" solution. Especially as IMHO it would be a nightmare if the stdlib would rely on such ENV checks

Ghost

@ghost~55586c4815522ed4b3e08557

@asterite what is the issue with is_a?, do you mean that multiple Crystal libs will have the issue that 2 different types may have the same type id?

From IRC (bridge bot)

@FromIRC

<Papierkorb_> @asterite, is the system configuration somehow exposed as string to the compiled program? Doing that isn't great: https://github.com/Papierkorb/bindgen/blob/next-gen/src/bindgen/config_reader/variables.cr#L20

ziprandom

@ziprandom

@sdogruyol hey is there a way to make kemal stop complaining about command line opts it doesn't know?

Ghost

@ghost~55586c4815522ed4b3e08557

For crystal-lang/crystal-book#119 he's trying to merge master to gitbook-3 is it really what should happen? (@asterite @mverzilli) What is this gitbook-3 branch for?

ziprandom

@ziprandom

@sdogruyol found it already ..

Martin Verzilli

@mverzilli

good catch! that's a pretty old branch that Brian used to update gitbook deps

I'll kill that branch

thanks @bew !

Ghost

@ghost~55586c4815522ed4b3e08557

you're welcome, I've had issues like this with people new to git(hub) lately, I saw that coming ^^

Ghost

@ghost~55586c4815522ed4b3e08557

@mverzilli you mistyped the branch name in your comment on the PR: github-3 => gitbook-3

Elias Perez

@eliasjpr

https://teespring.com/crystal-language-v-neck-tee?tsmac=store&tsmic=amber-framework#pid=76&cid=5848&sid=front

https://teespring.com/crystal-language-v-next-stacke?tsmac=store&tsmic=amber-framework#pid=76&cid=5844&sid=front

What you guys think ;)

Stephan Langeveld

@Fanna1119

how would i get the value of items inside a 2d kind of a hash array, i honestly don't even know what terminology to use :D


content = {:id => "3kTMd",
  :lists => [{:tags => "false",
  :url => "http://localhost:8080/"}]
}

x = content[:lists]

puts x

Ghost

@ghost~55586c4815522ed4b3e08557

@eliasjpr :+1:

Elias Perez

@eliasjpr

Im ordering a set of them :)

Ghost

@ghost~55586c4815522ed4b3e08557

@eliasjpr I was thinking about one with big logo on the back (with Crystal written under) (with my pseudo at the top! ^^) on a little <logo + Crystal> on the front left, but those a great start! :p

Ary Borenszweig

@asterite

content[:lists].as(Array)

Stephan Langeveld

@Fanna1119

@asterite Awesome! Thank You!! :)

Zafar Ansari

@ansarizafar

If a method name is stored in a variable how can I run it?

Ghost

@ghost~55586c4815522ed4b3e08557

you can't

Jason Waldrip

@jwaldrip

Crystal is not as meta as ruby.

@ansarizafar can you provide an example?

Zafar Ansari

@ansarizafar

After making several unsuccessful attempts of storing a proc in a Hash without specifying return type. Now I am trying to store a class method in a Hash so that I can later run it.

Like that
store[key] = User.list

how can I run list method which is store in a hash

Ghost

@ghost~55586c4815522ed4b3e08557

do you need to pass arguments to thoses methods when calling them?

Zafar Ansari

@ansarizafar

yes

Ghost

@ghost~55586c4815522ed4b3e08557

are they known when you add the method to the hash?

Zafar Ansari

@ansarizafar

Ary Borenszweig

@asterite

case key; when "list" then User.list; etc.

Zafar Ansari

@ansarizafar

I want to make it generic. Is there any syntax that I can use to run the method stored in hash directly.

Jason Waldrip

@jwaldrip

Can the proc/method return any type?

Zafar Ansari

@ansarizafar

Ideally I would like to store a proc block in hash without specifying return type as return type is not known in advance, but I think its not possible.

Jason Waldrip

@jwaldrip

If you know what the possible types could be you could store them in a union

Zafar Ansari

@ansarizafar

Like that

@@store = {} of String => (Hash(String, JSON::Type) -> _)

Jason Waldrip

@jwaldrip

or, let me ask a question... do you expect your method to always return something?

Or are you just trying to invoke a method that may just invoke something, not nessicarily return something?

Ghost

@ghost~55586c4815522ed4b3e08557

@ansarizafar do you need the return value when calling it?

Zafar Ansari

@ansarizafar

yes, It could be a NameTuple or an Array Of NamedTuples

Jason Waldrip

@jwaldrip

So use a union

Zafar Ansari

@ansarizafar

Yes I need return value

Jason Waldrip

@jwaldrip

If you know the various return types, just set it up as a union

Zafar Ansari

@ansarizafar

Return types are not known in advance. Namedtuple will be generated with the fields returned from Postgre Db depending on the query.

Will

@Willamin

Hi everyone! I've got an absolutely crazy question for you. I want to reopen the Integer structs and add a macro def that throws a compile time exception based on the value of the Integer. I can't find a definitive list of macro variables such as @type and @def. Can anyone here help?

Ghost

@ghost~55586c4815522ed4b3e08557

throw a compile time error when doing what @Willamin ?

Will

@Willamin

Contrived example: I'd like to add a .is_this_a_0_at_compile_time to Integers that throws a compile time error if it's called on a non-zero integer

0.is_this_a_0_at_compile_time # should compile fine
1.is_this_a_0_at_compile_time # should throw a compile time error

Ghost

@ghost~55586c4815522ed4b3e08557

how is this supposed to be used?

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