Bodacious

How to find an average value, without having to store every data point

This was a solution to a problem I was trying to solve on my webiste: how can I arrive at an average value over time, when new data is being provided, without having to store every datum.

I wrote this code to prove to myself that I wasn't crazy, and that this was indeed a valid way to calculate the mean.

Bodacious

# It's the class for users, silly.
class User
  
  # Ummm, initializes a new user
  def initialize(args)
    @first_name = args[:first_name]
    @last_name  = args[:last_name]
  end
  
  # :|

Bodacious

class Integer
  
  # PHI - Some greek number
  PHI   =  Rational(1836311903,1134903170).to_f

  # Inverse of 1/PHI
  I_PHI = -Rational(1, PHI).to_f

  # Square root of 5
  SQRT_5 = 5 ** 0.5

Bodacious

# PHI - Some greek number
PHI   =  Rational(610,377).to_f

# Negative inverse of PHI
I_PHI = -Rational(1, PHI).to_f

# Square root of 5
SQRT_5 = 5 ** 0.5

# Fibonacci value for given number x

Bodacious

[diff]
  tool = diff
  algorythm = minimal
[color]
  branch      = auto
  diff        = auto
  status      = auto
  interactive = auto
  ui          = true
  pager       = true

Bodacious

Rehearsal -------------------------------------------------
with freez      1.490000   0.010000   1.500000 (  1.493176)
with constant   1.500000   0.000000   1.500000 (  1.499597)
with new        2.060000   0.000000   2.060000 (  2.064578)
---------------------------------------- total: 5.060000sec

                    user     system      total        real
with freez      1.470000   0.000000   1.470000 (  1.480206)
with constant   1.500000   0.000000   1.500000 (  1.510912)
with new        2.030000   0.000000   2.030000 (  2.038113)

Bodacious

module NamespaceableController

  extend ActiveSupport::Concern

  included do
    helper_method :namespace
  end
  

  private

Bodacious

Explanation

So I thought I was being clever, writing my Rails controller actions like this:

def create
  set_post_from_post_id
  set_comment_as_new
  respond_to do |format|
    comment.save

Bodacious

require 'benchmark'

TIMES = 1000000

STRING = "this is a long and bad-ass string"

Benchmark.bmbm do |test|
  test.report("Index") do
    
    TIMES.times { STRING.index("this is") }

Bodacious

def should_nest_multiple_conditionals?
  x = rand(10).to_i
  if Time.now.strftime("%A") != "Friday"
    if current_client.is_large_faceless_conglomerate?
      return true
    elsif Time.now.strftime("%A") == "Friday"
      return true
    end
  elsif LocalWeather.new("Edinburgh").sunny?