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comp.lang.ruby

strange arrayfields behaviour

Jean-Denis Muys

2/6/2009 2:42:00 PM

Here is a counterintuitive behaviour of the arrayfields.rb module.

It's suppose to add light "indexing by keywords" capabilities to the Array
class, without going all the way to hashes.

See http://rubyfurnace.com/docs/arrayfie...

However, after deleting items from an array, there is mismatch in the fields.

Here is a small example:

>> require 'arrayfields'
=> true
>> ar = [1, 2, 3]
=> [1, 2, 3]
>> ar.fields = ["one", "two", "three"]
=> ["one", "two", "three"]
>> ar[1]
=> 2
>> ar["two"]
=> 2
>> ar
=> [1, 2, 3]
>> ar.delete_at("two") # ****** delete ar["two"] ******
=> 2
>> ar["two"] # ****** but there still is an ar["two"] ******
=> 3
>> ar
=> [1, 3]
>> ar["one"]
=> 1
>> ar["three"]
=> nil
>> ar.keys
=> ["one", "two", "three"]
>>

I don't believe this is a bug. But this bit me.
Lesson learned: arrayfields don't a Hash make.