From: "Matthew K. Williams" <matt@...>
Date: 2009-10-23T02:25:53+09:00
Subject: Re: convert/replace a value of nil with 0?

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On Fri, 23 Oct 2009, [ISO-8859-1] Jes=FAs Gabriel y Gal=E1n wrote:

> On Thu, Oct 22, 2009 at 6:07 PM, Paul Smith <paul@pollyandpaul.co.uk> wro=
te:
>> 2009/10/22 Jes=FAs Gabriel y Gal=E1n <jgabrielygalan@gmail.com>:
>>> On Thu, Oct 22, 2009 at 5:24 PM, Mmcolli00 Mom <mmc_collins@yahoo.com> =
wrote:
>>>> Do you know how I can convert or replace any value that gets back a
>>>> 'nil' to 0?
>>>>
>>>> For instance, the myArrayVal[0] may or may not contain a number and I
>>>> want the code to default to 0 if a nil is returned. I have not found a=
ny
>>>> documentation on this.
>>>
>>> irb(main):001:0> array =3D []
>>> =3D> []
>>> irb(main):002:0> value =3D array[0] || 0
>>> =3D> 0
>>> irb(main):003:0> value
>>> =3D> 0
>>>
>>> Hope this helps,
>>
>> Though that will of course convert false too.
>
> Sure, if you can have in the array things that are not numbers I think
> to_i as Gregory suggested should work in general. Or you can do it
> more explicitly like this:
>
> value =3D array[0].nil? ? 0 : array[0]
>

Or, being very evil......

class Array
   idx =3D self.instance_method(:[])
   define_method(:[]) do |x|
     n=3Didx.bind(self).call(x)
     return n.nil? ? 0 : n
   end
end

(this is based off of=20
http://blog.jayfields.com/2006/12/ruby-alias-method-alternative.html )

Matt
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