Don't name a method "next"!

MartinRinehart

Here is bug_splat.rb, which does as its name suggests when you try to load it.


def bug_splat()
    next()
end

Edit: typing next() into the Ruby Console gets a Bug Splat.

Jim

Hey cool, it "works" the same if you just type it in the Ruby Console.

next does not bugsplat, next() does.

thomthom

next is a Ruby reserved keyword used to control loop iteration.

Jim

next is also a method meaning "give me the next value."

1.next ==> 2 "a".next ==> "b"

MartinRinehart

@thomthom said:

next is a Ruby reserved keyword used to control loop iteration.

Some languages handle the misuse of a reserved word with a bit more grace.

Chris Fullmer

Try it from the rerula - non SU ruby command line editor. I doubt it will give a bugsplat Maybe it just returns an error, or critical error or something.

thomthom

@jim said:

next is also a method meaning "give me the next value."

1.next ==> 2 "a".next ==> "b"

Good point. But that leads to the question; is "reserved" really reserved in Ruby?
So next can be class method, but not a root method?

tbd

let's see (Mac, ruby 1.8.6, command line)

irb >> next()
LocalJumpError; unexpected next
	from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/workspace.rb;81;in `evaluate'
Maybe IRB bug!!

ruby -e "next()"
-e;1; unexpected next (LocalJumpError)

so it is more a ruby problem than a SU. but why the exception is not trapped by SU ?

thomthom

Windows7, Ruby 1.8.0 - Console Session (IRB)



C;\Users\Thomas>irb
irb(main);001;0> next()
LocalJumpError; unexpected next
        from C;/Ruby/lib/ruby/1.8/irb/workspace.rb;81;in `evaluate'
        from C;/Ruby/lib/ruby/1.8/irb/context.rb;219;in `evaluate'
        from C;/Ruby/lib/ruby/1.8/irb.rb;150;in `eval_input'
        from C;/Ruby/lib/ruby/1.8/irb.rb;263;in `signal_status'
        from C;/Ruby/lib/ruby/1.8/irb.rb;147;in `eval_input'
        from C;/Ruby/lib/ruby/1.8/irb/ruby-lex.rb;244;in `each_top_level_statement'
        from C;/Ruby/lib/ruby/1.8/irb/ruby-lex.rb;230;in `loop'
        from C;/Ruby/lib/ruby/1.8/irb/ruby-lex.rb;230;in `each_top_level_statement'
        from C;/Ruby/lib/ruby/1.8/irb/ruby-lex.rb;229;in `catch'
        from C;/Ruby/lib/ruby/1.8/irb/ruby-lex.rb;229;in `each_top_level_statement'
        from C;/Ruby/lib/ruby/1.8/irb.rb;146;in `eval_input'
        from C;/Ruby/lib/ruby/1.8/irb.rb;70;in `start'
        from C;/Ruby/lib/ruby/1.8/irb.rb;69;in `catch'
        from C;/Ruby/lib/ruby/1.8/irb.rb;69;in `start'
        from C;/Ruby/bin/irb;13
Maybe IRB bug!!
irb(main);002;0> exit

C;\Users\Thomas>