Array

Call the given block for every entry of the array and its predecessor. The block is supposed to accept two parameters. The block is not called at all if the array’s length is less than two.

 $ irb
 >> require 'plantwatchdog/aggregation_methods'
 => true
 >> [].each_prior{|x,y| x+y}
 => []
 >> [1].each_prior{|x,y| x+y}
 => []
 >> [1,2].each_prior{|x,y| x+y}
 => [3]
 >> [1,2,3].each_prior{|x,y| x+y}
 => [3, 5]

# File lib/plantwatchdog/aggregation_methods.rb, line 35
  def each_prior()
    i=0
    result=[]
    while (i < self.size-1) do
      result << yield(self[i],self[i+1])
      i+=1
    end
    return result
  end