Rails - Sep 2007 - Why Ruby has 2 APIs(Ruby Core API&Ruby Standard API)??

first question as titled.

otherwise, what''s their relationship?? i had confuse about it.

and what''s the building package and class (do need to
"require", like
java.lang.* in Java )? how do i know it?


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I mean

"require" no need, just like
java.lang.* in Java

On Sep 19, 1:27 am, Ruby Nudy
<mis.jerr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> first question as titled.
>
> otherwise, what''s their relationship?? i had confuse about it.
>
> and what''s the building package and class (do need to
"require", like
> java.lang.* in Java )? how do i know it?

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On Tue, 18 Sep 2007, Ruby Nudy wrote:
> 
> I mean
> 
> "require" no need, just like
> java.lang.* in Java
> 
> On Sep 19, 1:27 am, Ruby Nudy
<mis.jerr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > first question as titled.
> >
> > otherwise, what''s their relationship?? i had confuse about
it.
Classes and modules in the core are available without doing require.
Classes and modules in the standard library are brought in with require,
but there is not a one-to-one mapping like in Java. You can require a
file that defines 3 modules and 2 classes, for example.
> >
> > and what''s the building package and class (do need to
"require", like
> > java.lang.* in Java )? how do i know it?
You need to read the documentation for each library that you use, to know it.

If you are coming from java there are resources for people taking that
route, including a book.  I have not read this book:

http://www.pragmaticprogrammer.com/title/fr_j2r/

Search google: ruby for java
It turns up many pages.

        Hope this helps,
        Hugh

        

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huh??

for example, "PP", i can find this package in both APIs. but need
"require", so i still confuse. >"<

arr = ["apple", "orange", "watermelon"]
pp arr
#=> hello.rb:4: undefined method `pp'' for main:Object
(NoMethodError)

require "pp"
arr = ["apple", "orange", "watermelon"]
pp arr
#=>["apple", "orange", "watermelon"]

On Sep 19, 2:06 am, Hugh Sasse
<h...-C9usXPTk/FFaa/9Udqfwiw@public.gmane.org>
wrote:
> On Tue, 18 Sep 2007, Ruby Nudy wrote:
>
> > I mean
>
> > "require" no need, just like
> > java.lang.* in Java
>
> > On Sep 19, 1:27 am, Ruby Nudy
<mis.jerr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > first question as titled.
>
> > > otherwise, what''s their relationship?? i had confuse
about it.
>
> Classes and modules in the core are available without doing require.
> Classes and modules in the standard library are brought in with require,
> but there is not a one-to-one mapping like in Java. You can require a
> file that defines 3 modules and 2 classes, for example.
>
>
>
> > > and what''s the building package and class (do need to
"require", like
> > > java.lang.* in Java )? how do i know it?
>
> You need to read the documentation for each library that you use, to know
it.
>
> If you are coming from java there are resources for people taking that
> route, including a book.  I have not read this book:
>
> http://www.pragmaticprogrammer.com/title/fr_j2r/
>
> Search google: ruby for java
> It turns up many pages.
>
>         Hope this helps,
>         Hugh

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