Module: DigitArray

Defined in:
lib/digit_array.rb

Class Method Summary collapse

Class Method Details

.convert(n, digits, places) ⇒ Object

n - an integer (try 1, or 5, for example) digits - list of digits in this imaginary number - try weird lists like:

- [0, 1, 2]
- [nil, :foo, :bar]
- ['hey', 'ho', 'let', 'us', 'go']

places - the number of places you want in the output array

ex:

convert(3, [0, 1, 2, 3, 4, 5], 2)
=> [0, 3]

convert(6, ['-', 'a', 'b', 'c'], 3)
=> ['-', 'a', 'b']

convert(11, ['Foo', 'Bar', 'Baz'], 4).join
=> "FooBarFooBaz"



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# File 'lib/digit_array.rb', line 19

def self.convert(n, digits, places)
  base = digits.length
  result = [digits[0]] * places
  remaining = n

  (-places..-1).each do |i|
    place_value = base**(i.abs-1)
    digit = remaining / place_value
    result[i] = digits[digit]
    remaining -= digit*place_value
  end

  result
end