chriskillpack

// Middleware provides an http.Handler that verifies an incoming request as coming from the Alexa
// web service using the steps described at https://developer.amazon.com/en-US/docs/alexa/custom-skills/host-a-custom-skill-as-a-web-service.html#manually-verify-request-sent-by-alexa
// Note: validation requires an HTTP GET of an Amazon certificate. Configure the middleware with an
// http.Client to have some control over the fetch.
package alexa

import (
	"bytes"
	"context"
	"crypto"

chriskillpack

// Solve the Poisson equation for a 2D grid using the Gauss-Seidel method
// Gauss-Seidel method: https://en.wikipedia.org/wiki/Gauss–Seidel_method

// The problem used is Example 1 from https://my.ece.utah.edu/~ece6340/LECTURES/Feb1/Nagel%202012%20-%20Solving%20the%20Generalized%20Poisson%20Equation%20using%20FDM.pdf
// A 4x4 grid of electrical values
//   - top boundary is Dirichlet boundary fixed at 1.0V
//   - bottom boundary is Dirichlet boundary fixed at 0.0V
//   - left & right boundaries are Neumann boundaries fixed at derivative 0.0V

package main

chriskillpack

/*
Convert the box drawing characters of PC codepage 437 to Unicode
and encode as UTF-8.

If no argument is provided then program reads from stdin. These are equivalent:
	437toutf8 437in.txt > utf8out.txt
	437toutf8 < 437in.txt > utf8out.txt
*/

package main

chriskillpack

package main

import "fmt"

// A Morton code (aka z-order) interleaves the individual bits of X & Y
// coordinates. Below are routines that show how to generate a Morton
// code from X & Y integer coordinates in range [0,31) and do the reverse.
// The goal of these routines is to be educational (primarily me) and
// are not optimal. A diagram showing how Morton codes cover a 2D space
// would be nice...

chriskillpack

// Broadcast Wake On LAN packet, see https://en.wikipedia.org/wiki/Wake-on-LAN#Magic_packet
package main

import (
	"fmt"
	"log"
	"net"
	"os"
	"strings"
	"time"

chriskillpack

#!/usr/bin/env ruby
# Convert a decimal number into its 32-bit IEEE754 floating-point
# representation.
# Example:
#   $ ./floating-point.rb -1313.3125
#   Decimal: -1313.3125
#   As binary fraction: 010100100001.0101
#   Exponent = ^10 = 1024 = 10001001
#   Mantissa = 01001000010101000000000
#   11000100101001000010101000000000

chriskillpack

# My explorations into ruby modules and instance variables.
module TestModule
  def tm_foo
    @bar = 1
  end

  def self.hello
    'world'
  end
end

chriskillpack

chrome.tabs.onUpdated.addListener(function() {
  window.console.log('updated from background');
});

chriskillpack

# A vanilla Trie class.
# Only interesting thing is gather_words_along_path.
class Trie
  def initialize(filename = nil)
    @trie = [{}, false]
    @word_count = 0
  end
  
  def to_s
    "words: #{@word_count}"