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      def res params
        begin
        # do something      
        Rails.logger.info "debug #{Time.now.to_datetime}"
        Rails.logger.info params
        rescue Exception => e
          Rails.logger.info "debug_Exception #{Time.now.to_datetime}"
          Rails.logger.info e.message
        end
      end

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gem 'rack-cors'

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a = true
b = false

# if one of variable false run exception

if !a or !b
  p 'ERROR 1' # +
end

unless a or b

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pkill -o chrome && pkill -o chromium

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# E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable) 
# E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?

sudo lsof /var/lib/dpkg/lock
sudo kill -9 <PID> && sudo dpkg --configure -a

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// Show log
tail -f /var/log/mysqld.log

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# WAY 1
url = 'https://www.example.com/post/hello-world'
subdomain = 'blog'

index = url.index('://www.') ? url.index('://www.') + 7 : url.index('://') + 3
url.insert(index, subdomain + '.')
p url

# WAY 2
url = 'https://www.example.com/post/hello-world'

sorokadima

RUBY extend include statement

extend - додає методи до самого класу.
include - додає методи до екземпляру класу.

extend

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'my_name'.split('_').collect(&:capitalize).join
# => "MyName" 

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<?php

$obj = (object) ['a' => 'b'];
echo $obj->a;