Module: RRList::Functions

Defined in:
lib/rrlist/functions.rb

Overview

A helper module that provides some Proc object to be use with RRList::List

Examples:

RRList::List.new :size => 10, :range => 5, &RRList::Functions.max
RRList::List.new :size => 10, :range => 5, &RRList::Functions.incr

Author:

  • Federico Dayan

Class Method Summary collapse

Class Method Details

.avg ⇒ Proc

Returns A proc to be used in a RRList::List that calculates the average of the values inserted at and index.

Returns:

  • (Proc) —

    A proc to be used in a RRList::List that calculates the average of the values inserted at and index



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# File 'lib/rrlist/functions.rb', line 11

def self.avg
  Proc.new do |index, old_value, new_value|
    case new_value
      when Hash
        if old_value
          {
            value: RRList::Functions.calc_average(old_value[:size],old_value[:value],new_value[:value],new_value[:size]),
            size: old_value[:size] + new_value[:size]
          }
        else
          {
            value: new_value[:value],
            size: new_value[:size],
          }
        end
      else
         if old_value
          {
            value: RRList::Functions.calc_average(old_value[:size],old_value[:value],new_value),
            size: old_value[:size] + 1
          }
        else
          {
            value: new_value,
            size: 1,
          }
        end
     end
  end
end

.decr ⇒ Proc

Returns A proc to be used in a RRList::List decrements the values inserted at and index.

Returns:

  • (Proc) —

    A proc to be used in a RRList::List decrements the values inserted at and index



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# File 'lib/rrlist/functions.rb', line 64

def self.decr
  Proc.new do |index, old_value, new_value|
    old_value ? (old_value - new_value) : new_value
  end
end

.incr ⇒ Proc

Returns A proc to be used in a RRList::List increments the values inserted at and index.

Returns:

  • (Proc) —

    A proc to be used in a RRList::List increments the values inserted at and index



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# File 'lib/rrlist/functions.rb', line 57

def self.incr
  Proc.new do |index, old_value, new_value|
    old_value ? (old_value + new_value) : new_value
  end
end

.max ⇒ Proc

Returns A proc to be used in a RRList::List that calculates the max of the values inserted at and index.

Returns:

  • (Proc) —

    A proc to be used in a RRList::List that calculates the max of the values inserted at and index



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# File 'lib/rrlist/functions.rb', line 43

def self.max
  Proc.new do |index, old_value, new_value|
    old_value.nil? || (new_value > old_value) ? new_value : old_value
  end
end

.min ⇒ Proc

Returns A proc to be used in a RRList::List that calculates the min of the values inserted at and index.

Returns:

  • (Proc) —

    A proc to be used in a RRList::List that calculates the min of the values inserted at and index



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# File 'lib/rrlist/functions.rb', line 50

def self.min
  Proc.new do |index, old_value, new_value|
    old_value.nil? || (new_value < old_value) ? new_value : old_value
  end
end