50 lines
948 B
Crystal
50 lines
948 B
Crystal
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# A unicorn is a **legendary animal** (see the `Legendary` module) that has been
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# described since antiquity as a beast with a large, spiraling horn projecting
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# from its forhead.
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#
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# To create a unicorn:
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#
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# ```
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# unicorn = Unicorn.new
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# unicorn.speak
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# ```
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#
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# The above produces:
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#
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# ```text
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# "I'm a unicorn"
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# ```
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#
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# Check the number of horns with `#horns`.
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class Unicorn
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include Legendary
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# Creates a unicorn with the specified number of *horns*.
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def initialize(@horns = 1)
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raise "Not a unicorn" if @horns != 1
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end
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# Returns the number of horns this unicorn has
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#
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# ```
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# Unicorn.new.horns # => 1
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# ```
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def horns
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@horns
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end
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# ditto
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def number_of_horns
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horns
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end
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# Makes the unicorn speak to STDOUT
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def speak
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puts "I'm a unicorn"
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end
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# :nodoc:
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class Helper
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end
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end
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