# AH OOP concepts

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The first STACS up-skilling series offered an in-depth look at OOP for advanced higher and in particular polymorphism. The series begins with OOP basics and then reviews key ideas about object types, subclasses and arrays of objects. The final sessions focus on what polymorphism concepts are expected for AH.
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<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="image">Cover image</th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><h4>OOP session 1</h4></td><td>OOP basics</td><td><a href="/files/Qgx0BPAnwlMAgaYpSKqC">/files/Qgx0BPAnwlMAgaYpSKqC</a></td><td><a href="/pages/Pp1MQDTgeML17V1qA4xl">/pages/Pp1MQDTgeML17V1qA4xl</a></td></tr><tr><td><h4>OOP session 2</h4></td><td>Inheritance</td><td><a href="/files/xqvMSqsM6M0X9kBQX6hQ">/files/xqvMSqsM6M0X9kBQX6hQ</a></td><td><a href="/pages/gdA505kFJy1TB8xAlplb">/pages/gdA505kFJy1TB8xAlplb</a></td></tr><tr><td><h4>OOP session 3</h4></td><td>object reference type</td><td><a href="/files/8HmN6aJ1kuuyTXsJJH3J">/files/8HmN6aJ1kuuyTXsJJH3J</a></td><td><a href="/pages/RD3zVaNYZdyLDKXAyqQO">/pages/RD3zVaNYZdyLDKXAyqQO</a></td></tr><tr><td><h4>OOP session 4</h4></td><td>Polymorphism, array of objects</td><td><a href="/files/vEDRcyaNe2ycsknfSJet">/files/vEDRcyaNe2ycsknfSJet</a></td><td><a href="/pages/wBLOTQEkveq6PjtH0m8h">/pages/wBLOTQEkveq6PjtH0m8h</a></td></tr></tbody></table>


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