Help with Xcode what is the difference between a Function, class and object

Hi all,
I'm new here and in programming in Xcode. My question is can somebody tell me what the difference is between functions classes and object. I will appreciate it if you can involve some articels or something else.
Many thanks,
RL6001

Do a Google search for object-oriented programming. When I did, I found the following tutorial, which explains what objects and classes are:
Object Oriented Programming Tutorial

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