Have a syntax similar to Ruby (but compatibility with it is not a goal)

Statically type-checked but without having to specify the type of variables or method arguments.

Be able to call C code by writing bindings to it in Crystal.

Have compile-time evaluation and generation of code, to avoid boilerplate code.

Compile to efficient native code.


# A very basic HTTP server
require "http/server"
server = HTTP::Server.new(8080) do |context|
  context.response.content_type = "text/plain"
  context.response.print "Hello world, got #{context.request.path}!"
end
puts "Listening on http://127.0.0.1:8080"
server.listen


https://crystal-lang.org/