![FRIENDLY SYNTAX
def fibonacci(n)
return n if n <= 1
fibonacci(n - 1) + fibonacci(n - 2)
end
number = (ARGV[0]? || "40").to_i
puts "Calculating fibonacci for: #{number}"
puts fibonacci(number)
RUBY MOSTLY
Adrian Madrid Downtown Ruby Group May 2016](https://image.slidesharecdn.com/crystal-lightningtalk-drug2016-160602020438/85/Crystal-lightning-talk-drug-2016-3-320.jpg)
![COMPILES INTO FAST NATIVE CODE MICRO SECOND FAST
require “http/server”; require "http/server/handler"
host = "0.0.0.0"
port = 8080
handlers = [
HTTP::ErrorHandler.new,
HTTP::LogHandler.new,
HTTP::StaticFileHandler.new(“.")
]
server = HTTP::Server.new(host,port, handlers) do |context|
context.response.content_type = "text/plain"
context.response.print "Hello world!"
end
puts "Listening on http://0.0.0.0:8080"
server.listen
$ crystal build —release http_server.rb
$ ./http_server
Listening on http://0.0.0.0:8080
GET / - 200 (725µs)
GET / - 200 (82µs)
GET / - 200 (57µs)
Adrian Madrid Downtown Ruby Group May 2016](https://image.slidesharecdn.com/crystal-lightningtalk-drug2016-160602020438/85/Crystal-lightning-talk-drug-2016-6-320.jpg)
Crystal lightning talk - drug 2016
- 1. Downtown Ruby Group May 2016Adrian Madrid CRYSTAL LANG friendly, static, modern, compiled
- 2. TL;DR VERY COOL Adrian Madrid Downtown Ruby Group May 2016
- 3. FRIENDLY SYNTAX def fibonacci(n) return n if n <= 1 fibonacci(n - 1) + fibonacci(n - 2) end number = (ARGV[0]? || "40").to_i puts "Calculating fibonacci for: #{number}" puts fibonacci(number) RUBY MOSTLY Adrian Madrid Downtown Ruby Group May 2016
- 4. STATIC TYPE CHECKING ➤ All the benefits of static typing ➤ While figuring it all out on its own, mostly DOH CHECKING def foo(arg) arg + 1 end a = rand(2) == 0 ? 1 : nil puts foo(a) Adrian Madrid Downtown Ruby Group May 2016
- 5. MODERN STANDARD LIBRARY ➤ Spec (like RSpec) ➤ CSV, JSON, XML, YAML, Markdown ➤ HTTP Client & Server (WebSocket too) ➤ OAuth & OAuth2 ➤ SecureRandom, Levenstein, HTML Builder, etc. NEW STUFF Adrian Madrid Downtown Ruby Group May 2016
- 6. COMPILES INTO FAST NATIVE CODE MICRO SECOND FAST require “http/server”; require "http/server/handler" host = "0.0.0.0" port = 8080 handlers = [ HTTP::ErrorHandler.new, HTTP::LogHandler.new, HTTP::StaticFileHandler.new(“.") ] server = HTTP::Server.new(host,port, handlers) do |context| context.response.content_type = "text/plain" context.response.print "Hello world!" end puts "Listening on http://0.0.0.0:8080" server.listen $ crystal build —release http_server.rb $ ./http_server Listening on http://0.0.0.0:8080 GET / - 200 (725µs) GET / - 200 (82µs) GET / - 200 (57µs) Adrian Madrid Downtown Ruby Group May 2016
- 7. MACROS PRE-COMPILE METAPROGRAMMING macro define_method(name, content) def {{name}} {{content}} end end # This generates: # def foo # 1 # end define_method foo, 1 foo #=> 1 Adrian Madrid Downtown Ruby Group May 2016
- 8. SELF HOSTED ➤ Compiled and linked ➤ You can cross-compile too 98.2% IN CRYSTAL Adrian Madrid Downtown Ruby Group May 2016
- 9. LINKS ➤ Language - http://crystal-lang.org/ ➤ API - http://crystal-lang.org/api/ ➤ Code - https://github.com/manastech/crystal ➤ Docs - http://crystal-lang.org/docs/ ➤ Libraries - http://awesome-crystal.com/ GO CHECK IT OUT Adrian Madrid Downtown Ruby Group May 2016
- 10. http://crystal-lang.org/ Adrian Madrid Downtown Ruby Group May 2016