Hey,
OH ...I get it now !!! yipeee....this makes so much more sense!
Cheers,
Vidhi
···
-----Original Message-----
From: Forrest Chang [mailto:fkchang2000@yahoo.com]
Sent: Friday, February 11, 2005 10:00 AM
To: ruby-talk ML
Subject: Re: new to this language
Hi Vidhi:
You mentioned being only somewhat familiar with
C++/Java, but what Joao mentioned, is basically the
functional equivalent of a main() in a Java class.
This allows you to run the file by itself, i.e. ruby
file.rb, and allow you to easily reuse the contents in
another file, i.e.
(hello.rb)
def hello
puts "hello"
end
if $0 == __FILE__
hello
end
so you run it and you get
ruby hello.rb
hello
Compilation finished at Fri Feb 11 09:58:52
so now you want to reuse the contents of hello.rb
(beatles.rb)
require "hello"
def song_chorus
hello
puts "goodbye"
end
if $0 == __FILE__
song_chorus
end
you run this file and get a
hello
goodbye
Hope this helps.
Forrest
--- Joao Pedrosa <joaopedrosa@gmail.com> wrote:
Hi,
> > 3) Do you need a main and a makefile ? I am sure
you would need a main
> > to test it . If yes how do you save the main? In
what format?
>
> You don't need a main method. All Ruby code is
executed as it is seen by the
> interpreter. Some of the code above (superclass.rb
and myclass.rb) define
> classes and some of the code (another.rb) creates
an instance of a class and
> prints some output.Else, you can use
if __FILE__ == $0
p 'Hello World!'
endIn any file so the code in the if-block will be
executed only if the
file is being run directly by the interpreter (e.g.:
ruby
hello_world.rb). It's useful so you can have a file
that behaves like
a library and a program, depending on how it's
loaded. You load a
library with the require (or load) command (e.g.:
require 'open-uri').I like to use such capability to test one or another
thing in a file
while I'm working on it.Welcome to Ruby.
Cheers,
Joao
Fun.