The O.P did not state if he wanted the results in the same order as the original array.

Even without that requirement, if the original array contained duplicate values, a solution that collapsed the original into a hash would eliminate duplicates, and , IMHO, provide a wrong result.

However, 3 good solutions which do not collapse the original array have been provided by others, below.

I would suggest that educated_foo's (++) is the most portable,readable one with no dependencies.

     "A fanatic is one who redoubles his effort when he has forgotten his aim."—George Santayana

In reply to Re^3: Subtracting Lists by NetWallah
in thread Subtracting Lists by JimSki

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