Ruby_Drill:_Exploring_Scope_solution.rb

# Solution for Challenge: Ruby Drill: Exploring Scope. Started 2013-07-22T18:55:03+00:00

THIS_IS_A_CONSTANT = "constantS"

$global_var = "This is my global variable.  Don't Do THIS!!!"

def get_constant
  THIS_IS_A_CONSTANT
end

def get_global
  $global_var
end

# Ruby doesn't like this
# def set_constant=(word)
#   THIS_IS_A_constant = word
# end

def set_global=(word)
  $global_var = word
end

local_var = "local variable in GLOBAL scope - MARK"

def get_local_variable
  local_var
end

class BasicClass
  def initialize
    @instance_var = "instance variable in BasicClass - For Mark"
    @@class_var = "HEYYYYYYYYYYYYYYYYYYYYYYY"
  end

  attr_accessor :class_var
  
  # local_var not defined in this scope (it's local to global)
  # def get_local_variable
  #   local_var
  # end

  def get_instance_variable
    @instance_var
  end

  def set_instance_var=(word)
    @instance_var = word
  end

  # You cannot accesss this constant from within the class
  def get_constant
    THIS_IS_A_CONSTANT
  end

  def get_global
    $global_var
  end

  # Ruby doesn't like this
  # def set_constant=(word)
  #   THIS_IS_A_CONSTANT = word
  # end

  # Ruby doesn't like this
  # def set_global=(word)
  #   $global_var = word
  # end
end

test_basic_class = BasicClass.new

p test_basic_class.get_instance_variable

# This is no fun.  YOU CANNOT DO THIS
# test_basic_class.get_local_variable

test_basic_class.set_instance_var = "foo"

p test_basic_class.get_instance_variable

second_basic_class = BasicClass.new

second_basic_class.set_instance_var = "TODAY"

second_basic_class.get_instance_variable

test_basic_class.get_instance_variable

p get_constant

p get_global

p test_basic_class.get_constant

p test_basic_class.get_global

# YOU CANNOT DO THIS.  DO NOT REASSIGN CONSTANTS. NO. BAD
# test_basic_class.set_constant = "zach can't spell"
# p test_basic_class.get_constant