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3_30.rb
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class Wheel
attr_reader :rim, :tire
def initialize(rim, tire)
@rim = rim
@tire = tire
end
def diameter
rim + (tire * 2)
end
end
############################
# using fixed args
############################
class Gear
attr_reader :chainring, :cog, :wheel
def initialize(chainring, cog, wheel)
@chainring = chainring
@cog = cog
@wheel = wheel
end
# ...
def gear_inches
ratio * wheel.diameter
end
def ratio
chainring / cog.to_f
end
end
puts Gear.new(
52,
11,
Wheel.new(26, 1.5)).gear_inches
# => 137.0909090909091
############################
# using hash
############################
class Gear
attr_reader :chainring, :cog, :wheel
def initialize(args)
@chainring = args[:chainring]
@cog = args[:cog]
@wheel = args[:wheel]
end
# ...
def gear_inches
ratio * wheel.diameter
end
def ratio
chainring / cog.to_f
end
end
puts Gear.new(
:chainring => 52,
:cog => 11,
:wheel => Wheel.new(26, 1.5)).gear_inches
# => 137.0909090909091
puts Gear.new(
:wheel => Wheel.new(26, 1.5),
:chainring => 52,
:cog => 11).gear_inches
# => 137.0909090909091
############################
# using keyword args
############################
class Gear
attr_reader :chainring, :cog, :wheel
def initialize(chainring:, cog:, wheel:)
@chainring = chainring
@cog = cog
@wheel = wheel
end
# ...
def gear_inches
ratio * wheel.diameter
end
def ratio
chainring / cog.to_f
end
end
puts Gear.new(
:cog => 11,
:chainring => 52,
:wheel => Wheel.new(26, 1.5)).gear_inches
# => 137.0909090909091
puts Gear.new(
wheel: Wheel.new(26, 1.5),
chainring: 52,
cog: 11).gear_inches
# => 137.0909090909091