From: Mark Bush <mark@...>
Date: 2008-03-01T00:37:13+09:00
Subject: Re: Beginner Help with code example from book

Joseph L. Casale wrote:
> I am trying to understand how the following code knows not to count a 
> tile that has been previously counted, its an example from Chris Pine's 

> def continent_size world, x, y
> if world[y][x] != ' land'
> # Either it' s water or we already
> # counted it, but either way, we don' t
> # want to count it now.
> return 0
> end
> :
> world[y][x] = ' counted land'

The world is changed.  When ' land' is counted, it turns into ' counted 
land' so on iteration, the "if" sees that it is not land and returns 0.

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