corroded

require 'benchmark'

def it_fibonacci(n)
  fib_arr = [0,1]
  (2..(n.to_i) - 1).each do |x| 
    fib_arr << fib_arr[x-1] + fib_arr[x-2]
  end
  return fib_arr
end

corroded

After automatically updating Postgres to 9.6.1 via Homebrew, the pg_ctl start command didn't work.
The error was something like "database files are incompatible with server".

Database files have to be updated before starting the server, here are the steps that had to be followed:

# need to have both 9.6.1 and latest 9.5.x installed, and keep 9.6.1 as default
brew unlink postgresql
brew install postgresql95
brew unlink postgresql95
brew link postgresql

corroded

# Execute this file as follows and compare the results in ruby 1.8.*:
#
# ruby class_var_ex.rb
# ruby class_var_ex.rb "include module"
# ruby class_var_ex.rb "include module" "include global"
# ruby "include global"

@@test = 9 if ARGV.last == "include global"

module X

corroded

# Execute this file as follows and compare the results in ruby 1.8.*:
#
# ruby class_var_ex.rb
# ruby class_var_ex.rb "include module"
# ruby class_var_ex.rb "include module" "include global"
# ruby "include global"

@@test = 9 if ARGV.last == "include global"

module X