From: fabsy <fabbyfabs@...>
Date: 2006-08-16T07:15:09+09:00
Subject: Re: goto function?


Timothy Goddard skrev:

> fabsy wrote:
> > Hey!
> > I have been trying to find a goto function in ruby..
> > Like this:
> >
> > foo: bar
> > If blabla then GOTO foo
> >
> > Is there any command for exiting the app?
> > And how do I search ex a textfile for a certain word and delete it?
> >
> >
> > ------
> >
> > if value == "2"
> > 		system('clear')
> > 		print "[Opening file..]\n\n"
> > 			r_file = File.open( "file", "a") #Wrote this so I wouldn't get an
> > error like "File doesn't exist".
> > 			r_file = File.open( "file", "r")
> > 			print "-----\n"
> > 			print r_file.read
> > 			print "-----"
> > 			print "\n"
> > 			system ('ruby note.rb')  #is there anyway to restart or goto the
> > beginning of the script?
> > 		end
> >
> > -----
> >
> > Thanks!
>
> There is a reason why there are no gotos in Ruby or the vast majority
> of modern languages. They are the complete antithesis of good program
> design. You should be writing something more like this:
>
> while value == 2
>   begin
>     system("clear") # This is a pretty bad idea - it's not portable and
> completely unneccesary.
>     puts "[Opening file...]"
>     puts
>     File.open("file", "r") do |file|
>       puts "---"
>       puts file.read
>       puts "---"
>     end
>     system("ruby note.rb") # What is this for?
>   rescue Errno:ENOENT
>     puts "File does not exist."
>   end
> end
>
> This program properly handles file closing and uses exception handling
> to pick up problems with opening the file. Exceptions and simple loops
> can produce the same result as any GOTO mess while maintaining good
> structure. I would avoid system() as well, but you may have your
> reasons for using it.

Naa, Im just testing to create something simple.. I think thats the
best way of learning..
So the system() thingy is just for test. :)
the  system("ruby note.rb") was just a solution to get the script to
"restart", I know it's a bad way but I had to try it. The system(clear)
was just so the screen was cleared.