#
# Title: Enumeration of Constants in Ruby
# Example with and without explicit values
#
# Ruby does not have native enums like some languages,
# but we can simulate them using modules, constants, or classes.
# ---------------------------------------------------------
# Enum WITHOUT explicit values (auto‑increment simulation)
# ---------------------------------------------------------
module Color
RED = 0
GREEN = 1
BLUE = 2
end
# ---------------------------------------------------------
# Enum WITH explicit values
# ---------------------------------------------------------
module Status
OK = 1
WARNING = 5
ERROR = 6
CRITICAL = 10
end
# ---------------------------------------------------------
# Demonstration
# ---------------------------------------------------------
puts "Enum without explicit values:"
puts "RED = #{Color::RED}"
puts "GREEN = #{Color::GREEN}"
puts "BLUE = #{Color::BLUE}"
puts "\nEnum with explicit values:"
puts "OK = #{Status::OK}"
puts "WARNING = #{Status::WARNING}"
puts "ERROR = #{Status::ERROR}"
puts "CRITICAL = #{Status::CRITICAL}"
# Ruby also allows freezing modules to prevent modification
module FrozenDays
SUNDAY = 0
MONDAY = 1
TUESDAY = 2
freeze
end
puts "\nImmutable enum example:"
puts "SUNDAY = #{FrozenDays::SUNDAY}"
# Attempt to modify (will raise an error if uncommented)
# FrozenDays::SUNDAY = 99
puts "After modification attempt, SUNDAY = #{FrozenDays::SUNDAY}"
# ---------------------------------------------------------
=begin
run:
Enum without explicit values:
RED = 0
GREEN = 1
BLUE = 2
Enum with explicit values:
OK = 1
WARNING = 5
ERROR = 6
CRITICAL = 10
Immutable enum example:
SUNDAY = 0
After modification attempt, SUNDAY = 0
=end
