"julius sirait" <[EMAIL PROTECTED]> writes: > On 5/23/07, Widi Harsojo <[EMAIL PROTECTED]> wrote: >> >> >> >> >> >> >> irb(main):071:0> 1.class >> => Fixnum >> irb(main):072:0> 121312312312.class >> => Bignum >> irb(main):073:0> >> > > yoi. nah, kenapa untuk nilai yang sama, object_id nya sama. tebakan > nya kan karna class method new gak ada. tapi kenapa untuk bignum, > object_id nya beda padahal: > > irb(main):002:0> Fixnum.new > NameError: undefined method `new' for Fixnum:Class > from (irb):2 > irb(main):003:0> Bignum.new > NameError: undefined method `new' for Bignum:Class > from (irb):3 > > -- > Julius Sirait
Itu implementation artifact untuk performance reason: http://www.rubycentral.com/faq/rubyfaq-9.html vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv 9.3 What is the difference between an immediate value and a reference? Fixnum, true, nil, and false are implemented as immediate values. With immediate values, variables hold the objects themselves, rather than references to them. Singleton methods cannot be defined for such objects. Two Fixnums of the same value always represent the same object instance, so (for example) instance variables for the Fixnum with the value "one" are shared between all the "ones" is the system. This makes it impossible to define a singleton method for just one of these. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ YS.
