Add upcase_first method

activesupport/CHANGELOG.md

+*   Add `String#upcase_first` method.
+
+     *Glauco Custódio*
+
 ## Rails 5.0.0.beta3 (February 24, 2016) ##
 
 *   Deprecate arguments on `assert_nothing_raised`.

activesupport/lib/active_support/core_ext/string/inflections.rb

@@ -222,6 +222,13 @@ def humanize(options = {})
     ActiveSupport::Inflector.humanize(self, options)
   end
 
+  # Converts just the first character to uppercase.
+  #
+  #  'what a Lovely Day'.upcase_first # => "What a Lovely Day"
+  def upcase_first
+    ActiveSupport::Inflector.upcase_first(self)
+  end
+
   # Creates a foreign key name from a class name.
   # +separate_class_name_and_id_with_underscore+ sets whether
   # the method should put '_' between the name and 'id'.

activesupport/lib/active_support/inflector/methods.rb

@@ -140,6 +140,13 @@ def humanize(lower_case_and_underscored_word, options = {})
       result
     end
 
+    # Converts just the first character to uppercase.
+    #
+    #  'what a Lovely Day'.upcase_first # => "What a Lovely Day"
+    def upcase_first(string)
+      string[0].upcase.concat(string[1..-1])
+    end
+
     # Capitalizes all the words and replaces some characters in the string to
     # create a nicer looking title. +titleize+ is meant for creating pretty
     # output. It is not used in the Rails internals.

activesupport/test/core_ext/string_ext_test.rb

@@ -76,6 +76,10 @@ def test_titleize
     end
   end
 
+  def test_upcase_first
+    assert_equal "What a Lovely Day", "what a Lovely Day".upcase_first
+  end
+
   def test_camelize
     CamelToUnderscore.each do |camel, underscore|
       assert_equal(camel, underscore.camelize)