Extend Range to add new method : Range Extension « Range « Ruby

1. Ruby
2. Range
3. Range Extension

Extend Range to add new method

class Range                  # Open an existing class for additions
  def by(step)               # Define an iterator named by
    x = self.begin           # Start at one endpoint of the range
    if exclude_end?          # For ... ranges that exclude the end
      while x < self.end     # Test with the < operator
        yield x
        x += step
      end
    else                     # Otherwise, for .. ranges that include the end
      while x <= self.end    # Test with <= operator
        yield x
        x += step
      end
    end
  end                        # End of method definition
end                          # End of class modification

(0..10).by(2) {|x| print x}  # Prints "0246810"
(0...10).by(2) {|x| print x} # Prints "02468"

 

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