finish GemCity#16
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| end | ||
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| def thieves=(number) | ||
| fail TypeError, 'Input must be an integer' unless number.is_a? Integer |
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Check out the Integer method: http://ruby-doc.org/core-2.0.0/Kernel.html#method-i-Integer
Integer(42) #=> 42
Integer(:foo)
#=> TypeError: can't convert Symbol into Integer
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