OOP Word Drill Flashcards
class
Tell Ruby to make a new type of thing
object
Two meaning: the most basic type of thing and any instance of some thing.
instance
What you get when you tell Ruby to create a class.
def
How you define a function inside a class.
@
Inside the functions in a class, @ is a variable for the instance/object being accessed.
inheritance
The concept that one class can inherit traits from another class, much like you and your parents.
composition
The concept that a class can be composed of other classes as parts, much like how a car has wheels.
attribute
A property classes have that are from composition and are usually variables.
is-a
A phrase to say that something inherits from another, as in “salmon” is-a “fish.”
has-a
A phrase to say that something is composed of other things or has a trait, as in “a salmon has-a mouth.”
class X
“Make a class named X that is-a y.”
class X:def initialize(J)
“class X has-a initialize that takes a J parameter.”
foo = X()
“Set foo to an instance of class X.”
foo.M(J)
“From foo get the M function, and call it with parameter J.”
foo.K = Q
“From foo get the K attribute and set it to Q.”
