From: 7stud -- <bbxx789_05ss@...>
Date: 2007-11-10T09:43:06+09:00
Subject: Re: undefined local variable or method (filling an array)

Thufir wrote:
> I've been working on this for quite some time and don't understand the
> error:
>
> C:/code/monsters.rb:6: undefined local variable or method `monsters'
> for main:Ob
> ject (NameError)
> 

my_program.rb:

monsters[0] = 10

--output:--
undefined local variable or method `monsters' for main:Object 
(NameError)

Normally, variables spring into existence when you assign to them. 
However, the statement above works a little differently.  The characters 
'[]=' are actually the name of a method in the Array class.  That means 
the  the code above is using the variable monsters to call that method. 
However, in order to call a method of the Array class, you need an 
existing array instance.  But, nowhere in the code is an array 
previously assign to the variable monsters.


Try this instead:

my_program.rb:

monsters = []
monsters[0] = 10
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