Methods I

def2.rb

Methods III

# Place the array in a random order.  Floyd's alg.
def shuffle(arr)
    for n in 0...arr.size
        targ = n + rand(arr.size - n)
        arr[n], arr[targ] = arr[targ], arr[n] if n != targ
    end
end

# Make strange declarations.
def pairs(a, b)
    a << 'Insane'
    shuffle(b)
    b.each { |x| shuffle(a); a.each { |y| print y, " ", x, ".\n" } }
end
first = ['Strange', 'Fresh', 'Alarming']
pairs(first, ['lemonade', 'procedure', 'sounds', 'throughway'])
print "\n", first.join(" "), "\n"

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Here's another use of methods. Notice that when we send an array as a parameter, changes in the function do update the value to the caller.

One incidental thing we have not seen before is parallel assignment in the shuffle function which exchanges two values.

Methods I

Methods III