Tim Wolak wrote:
> I'm not sure if I'm using this the right way and I'm hoping you guys can
> help.
> 
> I am merging two hashes together using merge and need to keep the keys
> the same and subtract the difference between the two values.  The keys
> are account numbers and the values are the balances.  Not sure why the
> balances are not subtracting and creating the new value.
> 
> Thanks in advance.
> Tim
> 
>  class Calculate
>   attr_reader :sktyfuta, :sktyfutb
>   def initialize(sktyfuta, sktyfutb)
>     @sktyfuta = sktyfuta
>     @sktyfutb = sktyfutb
>   end
> 
>   def data_comp
>       @sktyfuta.merge(@sktyfutb) { |key, old_value, new_value| old_value
> - new_value }
>   end
> end

Hash.merge will give you a new Hash, a third one. If somewhere outside 
of your class you call the method data_comp, it will return this new 
Hash.

a = some_instance_of Calculate.datacomp
p a

I guess you expect @sktyfuta to change, but it won't unless you tell it 
to.

Regards,

Siep



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