[Ruby] On x.kind_of? MyClass or x.class ==MyClass

2008-09-10T16:59:18-07:00

I tend to see the use of ===

module M; end

class A; end

class B < A
  include M
end

b = B.new

A === b # => true
B === b # => true
M === b # => true

[Ruby] On Caesar Cipher

2008-08-09T06:49:18-07:00

I've always seen shifts done with the unix tr command. You can do the same in ruby. Additionally this method handles the rotation of chars like

caesar("ABCDEF",22) #=> "WXYZAB"

def caesar(text,n)
  alpha = ('A'..'Z').to_a
  n.times { alpha.push(alpha.shift) }
  text.tr('A-Z', alpha.join)
end