From: Mike Glaz <mikeglaz@...>
Date: 2007-03-04T02:13:20+09:00
Subject: Programming Ruby book p.50 (Fibonacci yield example)

here's the example:

1. def fib_up_to(max)
2.   i1,i2 = 1,1
3.   while i1 <= max
4.     yield i1
5.     i1, i2=i2, i1+i2
6.   end
7. end
8.
9. fib_up_to(1000) {|f| print f, " "}

I'm familiar with yield passing values to the block and vice-versa.  But
I have no clue what is happenening in line 5.  Or at least in general
can anyone explain what is going on here in these 9 lines of code?
(I've been programming for 10 years so I'm familiar methods, loops, etc.
it's just this yield thing I don't completely understand especially line
5.).

cheers,
mike

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