Announcements

• HW 06 Releases on Friday!
  • OOP related
• Ants gets released on Monday
  • my favourite project by far
  • i love this project
  • very good project

Notes from last section

• switch on the lights at the front
• cucumbr
  • 
• super comprehensive minilecture at the start of lab; oop tough
  • 
• Sometimes moved on from slides a little too quickly
  • yeah i agree
• hmmm. please discuss one of the lab problems.
  • usually don't have time during discussion to do this
  • ask during lab!

Notes from last section

• what is a regex
  • regular expression - basically lets you do find and replace with more general patterns to find
  • example: \s*[Pp]ok[eé]mon\s*
• Resources/exercises for learning about regex? I know it's useful but sems like dark magic to me.
  • tbh i have no idea, i just learned it when i took cs61a
  • fa21.cs61a.org

Notes from last section

• Can you go over how we can study efficiently. I feel like I study long hours but not getting anywhere. What helps what should we focus on how should we manage our time.etc.
  • everyone learns at difference paces and comes into this class with differing levels of experience
  • what i tend to find works well is doing the assignments (hw, optional lab questions) rather than just watching lectures, and afterwards, trying to come up with a real world use case
    • my mind tends to like seeing concepts in action in the real world, which is why this works for me

Notes from last section

• Place you want to travel to/one thing you have on your bucket list?
  • incheon this summer world championships is happening then and i'm planning on competing
• secret word: 6 people typed Pokémon out of 19 people

Temperature Check

• OOP
• Class Methods

What is OOP?

• One way I like to think of OOP is as a sort of 'advanced' data abstraction
  • You would use OOP for similar things that you would use data abstractions for
  • Can make a City class, for example
• OOP also allows for inheritance (less repetition of code, more on this later/next discussion)
• OOP also allows for mutation
  • Similar to list mutation (.append, .extend, etc.)
• You may have seen this if you've seen Java before (I didn't have any exposure to OOP when I took CS 61A for the first time)

OOP Terminology

• Class
  • A class is sort of a 'blueprint' for something. You can think of it as a template for creating an object
• Instance
  • An instance of a class is one object of that blueprint, or one physical object that you create based on your template
• Variables
  • Instance Variables: Variables unique to each instance (each actual object)
  • Class Variables: Variables shared between each instance in the same class
• Method
  • Function bound to a class

Functions vs Methods

• Methods need to take in self as an argument
  • This is very often implicitly passed in when the thing on the left side of the dot is an instance
  • my_car.drive(100) is the same as Car.drive(my_car, 100)
• self refers to the actual instance (rather than the class)
• Two ways of calling methods:
  • Class.method(self, args)
  • instance.method(args)

Class Methods

• Uses the @classmethod decorator
• Dog.robo_factory('Sally')
  • Creates new dog with name RoboDog and owner Sally

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