Tobias Pfeiffer PragTob

Falsehoods programmers believe about prices

You can store a price in a floating point variable.
All currencies are subdivided in 1/100th units (like US dollar/cents, euro/eurocents etc.).
All currencies are subdivided in decimal units (like dinar/fils)
All currencies currently in circulation are subdivided in decimal units. (to exclude shillings, pennies) (counter-example: MGA)
All currencies are subdivided. (counter-examples: KRW, COP, JPY... Or subdivisions can be deprecated.)
Prices can't have more precision than the smaller sub-unit of the currency. (e.g. gas prices)
For any currency you can have a price of 1. (ZWL)
Every country has its own currency. (EUR is the best example, but also Franc CFA, etc.)

I want to write software that helps kill people.

Please, before you call the police and get my github account put on lockdown, allow me a moment to explain. What I really want to do is work on projects that advance the human condition and improve people's lives. I've been in a mad dash to learn how to program for the past four or five years exactly because I realized how much good I could do for the world with a computer.

Training/Classes

Useful Sites/Blogs

List moved

Please use https://github.com/bf4/learning to fork and pull changes.

	10 DIM FourDigitPassword INTEGER
	20 FOR i = 0 TO 9
	30 FOR j = 0 TO 9
	40 FOR k = 0 TO 9
	50 FOR l = 0 TO 9
	60 FourDigitPassword = getFourDigits (i,j,k,l)
	70 IF checkPasswordMatch(FourDigitPassword) = TRUE THEN
	80 GOTO 140
	90 END
	100 NEXT l

	# This file modifies benchmark-ips to better accommodate the optimisation
	# characteristics of sophisticated implementations of Ruby that have a very
	# large difference between cold and warmed up performance, and that apply
	# optimisations such as value profiling or other speculation on runtime values.
	# Recommended to be used with a large (60s) warmup and (30s) measure time. This
	# has been modified to be the default. Note that on top of that, it now runs
	# warmup five times, so generating the report will be a lot slower than
	# before.

	# Code is modified from benchmark-ips

	require "rubygems"
	require "braintree"

	transaction_attributes = {
	:amount => "1000.00",
	:credit_card => {
	:number => "5105105105105100",
	:expiration_date => "05/12"
	}
	}

	require 'benchmark/ips'

	class FakeDimension
	def initialize
	@margin_start = 10
	@margin_start_relative = false
	end

	def relative?(result)
	result.is_a?(Float) && result <= 1

	require_relative "../helper"

	describe "A room" do
	let(:room) { Wumpus::Room.new(12) }

	it "has a number" do
	room.number.must_equal(12)
	end

	it "may contain hazards" do

	#!/usr/bin/env ruby

	require 'rubygems'
	require 'bundler/setup'
	require 'celluloid'

	class Table
	include Celluloid
	CHOPSTICK_FREE = 0
	CHOPSTICK_USED = 1