Class: Integer

Inherits:
Object
  • Object
show all
Defined in:
lib/xqsr3/extensions/integer/to_s_grp.rb

Instance Method Summary collapse

Instance Method Details

#to_s_grp(*args, **options) ⇒ Object

Extends Integer type with the #to_s_grp() method



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# File 'lib/xqsr3/extensions/integer/to_s_grp.rb', line 53

def to_s_grp *args, **options

  separator = options[:separator] || ','

  numbers =
  case args.size
  when 0

    []
  when 1
    case args[0]
    when ::Array

      args[0]
    when ::Integer

      [ args[0] ]
    else

      raise TypeError, "parameter 'args[0]' (#{args[0].class}) must be an instance of Integer, or an array containing instance(s) of Integer"
    end
  else

    args
  end


  case numbers.size
  when 0

    return self.to_s
  when 1

    return self.to_s.chars.to_a.reverse.each_slice(numbers[0]).map(&:join).join(',').reverse
  else

    reversed_chars = self.to_s.chars.to_a#.reverse

    r = []

    last_n = nil

    numbers.each do |n|

      r << separator unless r.empty?
      r << reversed_chars.pop(n).reverse

      last_n = n
    end

    until reversed_chars.empty?

      r << separator unless r.empty?
      r << reversed_chars.pop(last_n).reverse
    end

    r.flatten.join('').reverse
  end
end