Active Support @ngtk 

ActiveSupport͸͔Θ͍͍ 

͓඼ॻ͖ • ActiveSupportͱ͸Կ͔ • CoreExt • AcctiveSupport::* Ҿ༻: http://railsguides.jp/active_support_core_extensions.html 

Active Supportͱ͸ʁ • Active Support͸Ruby on RailsͷίϯϙʔωϯτͰ ͋ΓɺRubyݴޠͷ֦ுɺϢʔςΟϦςΟɺͦͷଞԣ அతͳ࡞ۀΛ୲͍ͬͯ·͢ɻ • Active Support͸ݴޠϨϕϧͰجຊ෦෼Λఈ্͛͠ ͯ๛͔ͳ΋ͷʹ͠ɺRailsΞϓϦέʔγϣϯͷ։ൃͱ Ruby on RailsͦΕࣗମͷ։ൃʹ໾ཱͯΔ΂͘࡞ΒΕ ͍ͯ·͢ɻ Ҿ༻: http://railsguides.jp/active_support_core_extensions.html 

CoreExt Hash Class Date DateTime File Float Integer Kernel Module Enumerable Array String Autoload JSON Cache Notifications ActiveSupport:: Configurable Concern TimeZone XmlMini KeyGenerator Logger OrderedHash OrderedOptions Rescuable SecurityUtils TimeWithZone MessageVerifier MessageEncryptor Callbacks ArrayInquirer StringInquirer 

Object ‘ ’.blank? # => true # blank 

Object name = ‘yoda’ name.try(:upcase) # => “YODA” # try name = nil name.try(:upcase) # => nil 

Object sizes = [1, 2, 3, 4, 5] sizes.try { |s| s.sum / s.size } # => 3 sizes = nil sizes.try { |s| s.sum / s.size } # => nil 

Object content = ‘The Jedi are a fictional and ancient monastic, spiritual, and academic meritocratic organization and the main protagonists in the fictional Star Wars universe, whose origins dates back to circa 25,000 BBY (Before Battle of Yavin; the destruction of the first Death Star).’ content.try { upcase.truncate } # => “THE JED...” 

String ‘Module’. constantize # => Module # ref 'puni_puni'.dasherize # => “puni-puni" ‘task_id’.humanize # => “Task” ‘test’.inquiry.test? # => true # StringInquirer 

String ‘active_record/errors’.camelize # => “ActiveRecord::Errors” <<-EOL.strip_heredoc __orange juice EOL => “orange juice” 

Array Array.wrap(0) # => [0] Array.wrap([0, 1, 2]) # => [0, 1, 2] Array.wrap(nil) # => [] 

Array %w(1 2 3 4 5 6 7 8 9 10).in_groups(3) # => [ ["1", "2", "3", "4"] ["5", "6", "7", nil] ["8", "9", "10", nil] ] 

Array %w(1 2 3 4 5 6 7 8 9 10).in_groups_of(3) # => [ ["1", "2", "3"] ["4", "5", "6"] ["7", "8", "9"] ["10", nil, nil] ] 

Array %w(1 2 3 4 5 6 7 8 9 10).in_groups_of(3) # => [ ["1", "2", "3"] ["4", "5", "6"] ["7", "8", "9"] ["10", nil, nil] ] 

Array %w( a b c d e ).second # => “b” %w( a b c d e ).third # => “c” %w( a b c d e ).fourth # => “d” %w( a b c d e ).fifth # => “e” (1..42).to_a.forty_two # => 42 

Array [‘apple’, ‘milk’, ‘orange’].to_sentense # => “apple, milk, and orange” 

Hash options.reverse_merge({size: 25 , velocity: 3}) # `{size: 25 , velocity: 3}.merge(options)`ͱಉ͡ # ண໨͍ͯ͠Δม਺ΛϨγʔόʹͰ͖Δ 

Numeric 3.kilobytes # => 372 5.megabytes # =>5242880 

Numeric, Integer # ActiveSupport::Duration , Numeric 4.weeks 5.days 30.seconds 1.month 

·ͱΊ • ීஈRailsͰ࢖͍ͬͯΔString, Array, Numeric ͳͲ͸͢΂ͯActiveSupportʹΑ֦ͬͯு͞Ε ͯΔΑ • ActiveSupport͸͔Θ͍͍