From: G Brandon Hoyt <qrprat77@...>
Date: 2010-09-23T22:00:16+09:00
Subject: Re: to make dot method dot method work?


>> irb(main):012:0> Mycompute.new("Abc").values
>> => "Abc"
>> irb(main):013:0>
>> irb(main):014:0* Mycompute.new("Abc").up
>> => "ABC"
>> irb(main):015:0> Mycompute.new("Abc").values.up
>> NoMethodError: undefined method `up' for "Abc":String
>>   from (irb):15
>>   from :0

Let's follow what happens, and maybe I will make more sense.
Mycompute.new("Abc")
^^^^^^^^^^^^^^^^^^^^
 creates a new object of class Mycompute with an instance variable of
@str equalling the string "Abc"

Mycompute.new("Abc").values
              ^^^^^^^^^^^^^
		Creates another new object with instance variable equal to "Abc" and
assigns value of @str to Class attribute @@result through the 'values'
method.
Mycompute.new("Abc").values returns a string

Mycompute.new("Abc").values.up
                           ^^^
			Now we must think about the type of what is returned from our chained
methods.
1. Mycompute.new creates a new object of type Mycompute,  Mycompute
objects have a method called 'values'
2. the method 'values' returns a string, and you attempt to call a
method defined for class Mycompute on an object of type String.

that don't work.