From: Markus Jais <info@...>
Date: 2003-06-19T08:18:04+09:00
Subject: question on blocks and iterators

hello


at the end is a sample code
this does not work as I want. I want to use each_if
to yield only the elements that support a certain criteria and then
do something with this elements. but
here the output is:

../bl.rb
e: 5
e: 8
e: 9
2
4
5
8
9

I do not want the numbers 2 and 4 to be printed

I could save the elements in an array and return it but I was wondering if
there is another possibility

Markus

class Array

    def each_if(&b)
        each do |e|
            if b.call(e)
                print "e: ", e, "\n"
                yield e
            end
        end
    end

end


a = [2, 4, 5, 8, 9]

a.each_if { |x| x > 4 }.each { |e| puts e }