From: Karthik Nar <karthik.nar@...>
Date: 2007-01-15T18:37:33+09:00
Subject: Re: How does Array.map work for 2D arrays?

yes makes sense!!

here's some experiments i did, and it's more of a ruby thing than a map 
thing!

irb(main):001:0>  a = 1, 2
=> [1, 2]

irb(main):002:0> def map(a) yield a end
=> nil

irb(main):003:0> map(a) { | x, y | p y }
2
=> nil

irb(main):004:0> map(a) {| x | p x }
[1, 2]
=> nil


> Two points. First, I don't know how it figures it out. Second, your 
> question can be "answered" by looking at another example...
> 
> a = [ [ 'billy', 'goat', 'cheese' ], [ 'silly', 'hats' ] ]
> 
> a.map { |x, y, z| z } # => ["cheese", nil]
> 
> Observation tells us that map isn't really figuring out that you have a 
> 2D array, it's simply assuming that if you're asking for two arguments 
> (or three or one-hundred), that your array has them.
> 
> Make sense?


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