unused Ruby ideas

new_ruby_ideas.rb

mattr_accessor - https://github.com/rails/rails/blob/master/railties/lib/rails/generators.rb#L24
levenshtein_distance for suggestions - https://github.com/rails/rails/blob/master/railties/lib/rails/generators.rb#L160
# https://github.com/rails/rails/blob/master/railties/lib/rails/generators.rb#L258

# Rescue from LoadError
# https://github.com/rails/rails/blob/master/railties/lib/rails/generators.rb#L334

[1] pry(main)> ["a","b","c","d"].to_sentence(last_word_connector: " and ")
=> "a, b, c and d"
# https://github.com/rails/rails/blob/master/railties/lib/rails/generators.rb#L162

class << (@@properties = [])
# https://github.com/rails/rails/blob/master/railties/lib/rails/info.rb#L9

# [8] pry(#<Array>)> [["a", 1], ["b", 2]].assoc("b")
=> ["b", 2]

# [9] pry(#<Array>)> "%-10s %s" % ["a", "b"]
=> "a          b"
# https://github.com/rails/rails/blob/master/railties/lib/rails/info.rb#L32

# [20] pry(#<Array>)> 'boo'.tap do |bee|
# [20] pry(#<Array>)*   bee << "bee"
# [20] pry(#<Array>)* end << "bop"
=> "boobeebop"

# Hash#fetch
# irb(main):025:0> {a:nil,b:1}.fetch(:a, 1)
=> nil

# Dir.chdir { .. } is equivalent to "perform within directory"
# https://github.com/rails/rails/blob/master/railties/lib/rails/paths.rb#L187

ActiveSupport::FileUpdateChecker.new(*paths) { ... }
# https://github.com/rails/rails/blob/master/railties/lib/rails/application/routes_reloader.rb#L26

# https://github.com/rails/rails/blob/master/railties/lib/rails/engine/configuration.rb#L56
# Nested initializers!

https://github.com/rails/rails/tree/master/activesupport/lib/active_support/core_ext
Core extensions to Ruby classes.