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object-oriented programming [See OOP]
objects
    bless operator and
    as blessed references
    creating
    destruction of
    encapsulation of
    filehandles and
    instances and
    structure considerations
    testing with isa and can methods 2nd
ok function (Test::Simple) 2nd
OO (object-oriented) modules
    exporting
    exporting and
    non-OO versus
    Test::More module
OOP (object-oriented programming)
    File::Spec module
    inheritance structures and
    overview
    versus non-OOP
ordered lists
our variables
overriding
    methods
    superclass methods 2nd
    UNIVERSAL class methods