Intro to Ruby - 07 - Classes: Part 01

001_basic_class.rb

## This is a basic Ruby class
class Employee
end

## We can create an object from this class
e = Employee.new # => #<Employe:0x37978873> #Or some other gibberish

002_class_properties.rb

## Classes can have properties, like name, age, etc
## properties can have 1 of three levels of access
## 
## attr_reader - read only, can't write
## attr_writer - write only, can't read
## attr_accessor - both read and write
## 
## These access levels are for the USER of the class, 
## you will have FULL access to the properties INSIDE
## the class.

class Employee
  attr_accessor :name
  attr_reader :age
  attr_writer :salary
end

e = Employee.new

## The name property is both read and write

e.name = "Michael Koby" # => "Michael Koby"
e.name # => "Michael Koby"

## The age property is read only so we can't set it
e.age = 32 # => NoMethodError

## The salary method is writable but not readable
## so we can set it, but we can't read its value
e.salary = 30000 # => 30000
e.salary # => NoMethodError