# Is GC a class or module? **URL:** \ **Category:** Ruby\ **Created:** [October 21, 2006, 2:59pm UTC](https://www.ruby-forum.com/t/is-gc-a-class-or-module/73119 "2006-10-21T14:59:38Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![alex-osu3](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/13edae/32.png) [@alex-osu3](https://www.ruby-forum.com/u/alex-osu3)\ **Post date:** [October 21, 2006, 2:59pm UTC](https://www.ruby-forum.com/t/is-gc-a-class-or-module/73119/1 "2006-10-21T14:59:38Z")
Hi guys, On page 8 of 2nd Pickaxe or when I type ri GC under a window prompt command I get the message 1. It looks like GC is a class. But on page 426 and page 491 it says GC is a built-in module. Since in Ruby a module and a class is different. So which one is correct? Do I miss something in message 1? Thanks, Li #############message 1 C:\>ri GC -------------------------------------------------------------- Class: GC The +GC+ module provides an interface to Ruby’s mark and sweep garbage collection mechanism. Some of the underlying methods are also available via the +ObjectSpace+ module. * * * ## Class methods: ``` disable, enable, start ``` ## Instance methods: ``` garbage_collect ``` ---
**Author:** ![alex-osu3](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/13edae/32.png) [@alex-osu3](https://www.ruby-forum.com/u/alex-osu3)\ **Post date:** [October 21, 2006, 3:03pm UTC](https://www.ruby-forum.com/t/is-gc-a-class-or-module/73119/2 "2006-10-21T15:03:27Z")
On Sat, Oct 21, 2006 at 09:59:45PM +0900, Li Chen wrote: } Hi guys, } } On page 8 of 2nd Pickaxe or when I type ri GC under a window prompt } command I get the message 1. It looks like GC is a class. But on page } 426 and page 491 it says GC is a built-in module. Since in Ruby a module } and a class is different. So which one is correct? Do I miss something } in message 1? % irb irb(main):001:0\> GC.class =\> Module irb(main):002:0\> } Thanks, } Li –Greg