From: Paul Jungwirth <once@9stmaryrd.com>
Date: 2009-03-20T11:15:55+09:00
Subject: Passing a named function instead of a code block?

Hello,

I have a question about ruby's feature that when you call a method, you
can pass in a block of code after the last argument. Instead of writing
a code block, suppose I already have a def'd method that would work just
as well. Is there any way I can pass that in directly? For example,
suppose I have this code:

#!/usr/bin/env ruby

def fib(n)
    a, b = 0, 1
    n.times do |i|
        a, b = b, a+b
    end
    b
end

c = [1, 2, 3, 4]

puts c.collect {|i| fib i}

That will print fib(1), fib(2), fib(3), fib(4). But why write a code
block that takes one argument and does nothing but call a function that
takes one argument? Is there some way I could have replaced the last
line with something like this?:

puts c.collect \fib

In python I could have written the last line thus:

print map(fib, (1, 2, 3, 4))

Does ruby have something similar?

Thanks,
Paul
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