Intro to Ruby - 09 - Methods in Classes

001_class_methods.rb

class Employee
  attr_accessor :name
  def self.new_with_name(name)
    output = self.new
    output.name = name
    return output
  end
end

# List all methods on the employee class and sort them
Employee.methods.sort
=> [... "new_with_name", ...]

# Use the class method to create a new employee with a name
e = Employee.new_with_name(“Michael Koby”)

e.name # => "Michael Koby"

# List all methods available on the object created with the class method
e.methods.sort
=> [...] #doesn't contain the new_with_name method because it's a CLASS method

002_instance_methods.rb

class Employee
  attr_reader :salary
  def initialize(name, salary)
    @name = name
    @salary = salary
  end
  def give_raise(percentage)
    @salary *= (1 + percentage)
    @salary = @salary.to_i
  end
end

# Initialize new object
e = Employee.new(“Michael Koby”, 50000)

# Call instance method "give_raise"
e.give_raise(0.05) # => 52500

# Check that the salary is the newer number
e.salary # => 52500