From: Brian Candler <b.candler@...>
Date: 2010-08-02T22:28:00+09:00
Subject: Re: Iteration through File.file? misses entries for which  File.file?(entry) == true

James Harrison wrote:
> The symbolic constant for truth is True, not true.

That is incorrect, as 5 seconds with irb will show you.

$ irb --simple-prompt
>> true
=> true
>> True
NameError: uninitialized constant True
  from (irb):2

(You may have been thinking of TrueClass and FalseClass, perhaps?)

> In either case, because File.file? returns either True or False, you can 
> drop the comparison:

It returns true or false, but yes the comparison can be removed.

> If this is truly a method in an object, though, bear in mind scoping 
> issues. pwdFiles is only available inside this method definition. When 
> you declare it in your intialize statement, prepend with a 
> scope-changing symbol. The most common in this case is @
> 
> def initialize
>     #will contain all file entries in the directory
>     @pwdFiles = []
> end

@ is not a "scope changing symbol". @pwdFiles is an instance variable of 
the object, whereas pwdFiles is a local variable. They are completely 
different concepts.

Since the OP wanted to return the value from the getFiles method, and 
not set any instance variables in the object, then a local variable is 
appropriate here.
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