Yevgeniy Anfilofyev questions

Yevgeniy Anfilofyev answers

• Prevent side effects in Ruby
• Merge two JSON with a matching ID in Rails
• in sinatra using erubis, default setting escape_html is true. sometimes hava to unescape
• Ruby Counting chars in a sequence not using regex
• RVM installation: `/usr/local/rvm': Permission denied
• Sinatra Locals vs. Instance Variables
• undefined method `require_relative' for main:Object when running build from sublime
• MongoDB : Unable to drop a Compound Index on a collection
• How to check if current locale is equal to a string
• How to concatenate arrays from multiple documents in MongoDB?