Class: Range

Inherits:
Object
  • Object
show all
Defined in:
lib/range_slice.rb

Instance Method Summary collapse

Instance Method Details

#slice(increment) ⇒ Object

Slices the range into smaller ranges of a given increment.

(1..1000).slice(300)
# => [1..300, 301..600, 601..900, 901..1000]

require 'active_support'
(7.days.ago..Time.now).slice(24.hours)
# => [Thu Apr 10 17:48:08 -0700 2008..Fri Apr 11 17:48:07 -0700 2008, 
      Fri Apr 11 17:48:08 -0700 2008..Sat Apr 12 17:48:07 -0700 2008, 
      Sat Apr 12 17:48:08 -0700 2008..Sun Apr 13 17:48:07 -0700 2008, 
      Sun Apr 13 17:48:08 -0700 2008..Mon Apr 14 17:48:07 -0700 2008,
      Mon Apr 14 17:48:08 -0700 2008..Tue Apr 15 17:48:07 -0700 2008,
      Tue Apr 15 17:48:08 -0700 2008..Wed Apr 16 17:48:07 -0700 2008,
      Wed Apr 16 17:48:08 -0700 2008..Thu Apr 17 17:48:07 -0700 2008,
      Thu Apr 17 17:48:08 -0700 2008..Thu Apr 17 17:48:08 -0700 2008]

Note: This method like most built-in range methods, doesn’t work with descending ranges (e.g., (1000..1).include? 2 returns false)



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# File 'lib/range_slice.rb', line 25

def slice(increment)
  start_values = [first]
  while self.include?(next_value = start_values.last + increment)
    start_values << next_value
  end
    
  end_values = []
  start_values.each do |start_value|
    end_value = start_value + increment - 1
    unless self.include? end_value 
      end_value = self.last
    end
    end_values << end_value
  end

  result = []
  start_values.each_with_index do |start_value, index|
    end_value = end_values[index]
    result << (start_value..end_value)
  end

  result
end