Combining arrays - element by element "and" and "or"
Collections (Arrays and Hashes) in Ruby example from a Well House Consultants training course
More on Collections (Arrays and Hashes) in Ruby [link]
Source code: mar Module: R107
first = [1,3,5,7,9]
second = [2,3,4,6,7]
# | merges two arrays, but if there are equal elements
# in the two lists it removes the duplicates from the second
third = first | second
# Let's do that again, but this time sort the merged list!
third = (first | second).sort
# And this time we'll look for common elements using &
third = first & second
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