gnarmis

ruby-1.9.2-p180 :001 > cat = Object.new
 => #<Object:0x0000010085bc58> 
ruby-1.9.2-p180 :002 > puts cat.methods.sort
!
!=
!~
<=>
==
===
=~

gnarmis

ruby-1.9.2-p180 :004 > def cat.has_nine_lives?
ruby-1.9.2-p180 :005?>   true
ruby-1.9.2-p180 :006?>   end
 => nil 
ruby-1.9.2-p180 :007 > cat.has_nine_lives?
 => true

gnarmis

def maxPrimeFactor(n) #=> maxPrimeFactor(600851475143) => 6857 in 2007.562 ms
  # limit the ridiculous range safely
  range = n**(1/Math.sqrt(n.to_s.length).floor.to_f)
  ary = (1..range).to_a
  # Sieve of Eratosthenes (replace with Sieve of Atkin?)
  for i in ary
    for j in ary
      if i != j
        if (j % i == 0)
          ary.delete(j)

gnarmis

#!/bin/bash
# run `compass watch` at pwd
# run `coffee -o scripts/ -cw coffee/` at pwd
type -P compass &>/dev/null  || { echo "Compass command not found."; exit 1; }
type -P coffee &>/dev/null  || { echo "Coffee command not found."; exit 1; }

if [ ! -d sass/ ] || [ ! -d scripts/ ]
then
  echo "Project not setup correctly! Put sass files in sass/ and coffee in coffee/"
else

gnarmis

# piping example in Ruby

def foo(data)
  data[:a] += 1
  data
end

def bar(data)
  data[:b] += 10
  data

gnarmis

#ruby1.9.3

def defn name, &b
  Object.send :define_method, name, &b
end

# this also works (surprisingly), albeit with a warning
# def defn name
#   Object.send(:define_method, name)
# end

gnarmis

# In Clojure, hash-maps are truly functions of keys to values.
# So you can do `(:a {:a 1})` and get `1` as the result
# Why not put this in Ruby?

# access keys of a hash like a function

class Object
  def respond_to?(method)
    if (method.to_s =~ /^_.*/) == 0
      true

gnarmis

"user": {
    "contributors_enabled": false, 
    "created_at": "Wed Sep 23 18:48:46 +0000 2009", 
    "default_profile": false, 
    "default_profile_image": false, 
    "description": "Mura is a Japanese Fusion Restaurant serving steak, sushi, seafood. Located in North Hills. Serving lunch and dinner.", 
    "favourites_count": 0, 
    "follow_request_sent": null, 
    "followers_count": 665, 
    "following": null, 

gnarmis

-- turn an Integer into a list of digits
digits = map (read . (:[])) . show

-- is a given fraction special?
special :: Integer -> Integer -> Bool
special n d
  | (n_rf / d_rf) == ((realToFrac (head ns)) / (realToFrac (head ds)))  = True
  | otherwise = False
  where n_rf = realToFrac n
        d_rf = realToFrac d

gnarmis

(ns euler.three
 (require [clojure.core.reducers :as r]))

(declare largest-prime-factor-for)
(declare factors-of)
(declare source-factors)
(declare source-naturals)
(declare factor?)
(declare prime?)
(declare certainty)