class Text::Format::Alpha

options for numbering that will control how the letters are presented when given as [](index). This numbering object will only provide 26 values (“a” .. “z”) unless :wrap is true.

:transform

The symbol representing the method to be called on the letter. This must be a method that does not require any arguments.

:postfix

The value that will be appended to the letter presented by []. Defaults to nil.

:prefix

The value that will be prepended to the letter presented by []. Defaults to nil.

:wrap

If true, then indexes will be wrapped from “z” to “a”.

a1 = Text::Format::Alpha.new(:postfix => ".")
puts a1[0]  # => "a."
puts a1[1]  # => "b.
puts a1[27] # => ""

a2 = Text::Format::Alpha.new(:prefix => "A.")
puts a2[0]  # => "A.a"
puts a2[1]  # => "A.b"
puts a2[27] # => ""

a3 = Text::Format::Alpha.new(:transform => :upcase)
puts a3[0]  # => "A"
puts a3[1]  # => "B"
puts a3[27] # => ""

a4 = Text::Format::Alpha.new(:wrap => true)
puts a4[0]  # => "a"
puts a4[27] # => "b"