@@ -635,31 +635,15 @@ In Ruby 1.9 the <tt>%</tt> string operator supports key-based interpolation, bot Active Support adds that functionality to <tt>%</tt> in previous versions of Ruby. -h4. +start_with?+ and +end_width?+ +h4. +starts_with?+ and +ends_width?+ -Ruby 1.8.7 and up define the predicates +String#start_with?+ and +String#end_with?+: - -<ruby> -"foo".start_with?("f") # => true -"foo".start_with?("g") # => false -"foo".start_with?("") # => true - -"foo".end_with?("o") # => true -"foo".end_with?("p") # => false -"foo".end_with?("") # => true -</ruby> - -If strings do not respond to those methods Active Support emulates them, and also defines their 3rd person aliases: +Active Support defines 3rd person aliases of +String#start_with?+ and +String#end_with?+: <ruby> "foo".starts_with?("f") # => true "foo".ends_with?("o") # => true </ruby> -in case you feel more comfortable spelling them that way. - -WARNING. Active Support invokes +to_s+ on the argument, but Ruby does not. Since Active Support defines these methods only if strings do not respond to them, this corner of their behaviour depends on the interpreter that runs a given Rails application. You change the interpreter, and +start_with?(1)+ may change its return value. In consequence, it's more portable not to rely on that and pass always strings. - h4. Access h5. +at(position)+ railties/guides/source/active_support_core_extensions.textile 79829560137ab6ab2ff1db3e5fa1977f4790152e Xavier Noria fxn@hashref.com http://github.com/lifo/docrails/commit/9754debb9a72f9385950e5282f3642b995ab76d8 9754debb9a72f9385950e5282f3642b995ab76d8 2009-11-09T14:50:32-08:00 2009-11-09T14:50:32-08:00 AS guide: removes docs for String#start_with? and String#end_with?, no longer in AS bad40da46afdc273856c9102217d231fb602d1f5 Xavier Noria fxn@hashref.com