rtoal

mkdir -p data/shard0/rs0 data/shard0/rs1 data/shard0/rs2
mongod --replSet s0 --logpath "s0-r0.log" --dbpath data/shard0/rs0 --port 37017 --fork --shardsvr
mongod --replSet s0 --logpath "s0-r1.log" --dbpath data/shard0/rs1 --port 37018 --fork --shardsvr
mongod --replSet s0 --logpath "s0-r2.log" --dbpath data/shard0/rs2 --port 37019 --fork --shardsvr
 
mongo --port 37017
config = {_id: "s0", members: [
  {_id: 0, host: "localhost:37017" },
  {_id: 1, host: "localhost:37018" },
  {_id: 2, host: "localhost:37019" }]};

rtoal

# Writes the class hierarchy of the core Ruby classes.

$nodes = Hash.new

module Hack # Hack to keep Node out of the result!
  class Node
    attr_reader :cls 
    attr_accessor :children
    def initialize(c)
      @cls = c

rtoal

BasicObject 
    Object (Kernel)
        Module 
            Class 
        NilClass 
        Data 
        TrueClass 
        FalseClass 
        Encoding 
        String (Comparable)

rtoal

class Circle
  attr_reader :r
  
  def initialize(x = 0, y = 0, r = 1)
    @x = x
    @y = y
    @r = r
  end
  
  def center

rtoal

class Animal
  def initialize(name)
    @name = name
  end
  def speak()
    "#{@name} says #{sound()}"
  end
end

class Cow < Animal

rtoal

import re
import sys
pattern = re.compile(r'"[\w]+":')

all = set([])
for line in sys.stdin:
    keys = re.findall(pattern, line)
    all.update(keys)
print all

rtoal

/*
 * bypass.c
 *
 * Try this on an x86 machine.  It does **not** print "1".
 */

#include <stdio.h>

void weird() {
  int a;

rtoal

arg = {'x': 0}

def f(param):
    same_ids = id(arg) == id(param)
    different_ids = not same_ids
    param = {'y': 4}
    arg_changed = 'y' in arg
    print('Call by value: {}'.format(different_ids))
    print('Call by sharing: {}'.format(same_ids and not arg_changed))
    print('Call by reference: {}'.format(same_ids and arg_changed))

rtoal

# Runtimes for various complexity functions, sort of.
#
# A hacked-together little Python3 script printing runtimes for various
# complexity functions to standard output.
#
# The script isn't very general or customizable; you have to edit the
# source code to explore different functions or use different values
# of n.

import math

rtoal

# 10-7-4 Water Jug Problem

# Get 2 units of water in the 7-container or the 4-container

# Starting state is (0,7,4)
# Operations are F10, F7, F4, T107, T104, T710, T74, T410, T47
# Goal states are (x,2,z) and (x,y,2)

operations = {
    'F10'  : lambda x, y, z: [10, y, z],