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Composition and Inheritance

Composition means one class holds a reference to another, using the referenced class to help it fulfil its mission. Inheritance is the superclass/subclass relationship.
  • The ++ operation concatenates two arrays
  • The zip method picks corresponding elements in its two arguments and forms an array of pairs. For instance, this expression:
Array(1, 2, 3) zip Array("a", "b")
Will evaluate to:
Array((1, "a"), (2, "b"))
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