Erik Vullings erikvullings

## README.md

      
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                erikvullings
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              August 29, 2015 14:14
            
              
                Grouped horizontal bar chart.
              
          
    This is an example of a horizontally grouped bar chart. It allows you to easily see the difference between different series of data.

  
## 0_reuse_code.js
// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

## scheduler.exs
# Example of a simple scheduler in Elixir
# Source code from the book Programming Elixir
# See: https://pragprog.com/book/elixir/programming-elixir
#
# Start iex
# $ iex
# > c("scheduler.exs")
# > Scheduler.run(12, FibSolver, :fib, [38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38])

defmodule Scheduler do

## fib_agent.exs
# Fast Fibonacci implementation (using a Map to cache previous results)
# This code comes from a mailing-list post by José Valim.
#
# Run iex
# $ iex
# > c("fib_agent.exs")
# > { :ok, agent } = FibAgent.start_link()
# > IO.puts FibAgent.fib(agent, 38)

defmodule FibAgent do

## gist:8e8d5ae026748681de8ddde90d835cde
# Phoenix, by default, uses a Postgres database, so start one via docker
docker pull postgres
# Expose it on port 8432
docker run -p 8432:5432 --name hello-postgres -e POSTGRES_PASSWORD=postgres -d postgres

# Install Erlang, Elixir, and now Phoenix
mix archive.install https://github.com/phoenixframework/archives/raw/master/phx_new.ez
# Create a new Phoenix app
mix phx.new hello
# Edit config/dev.exs and update your hostname. Add a port (default is 5432, but I've mapped it to 8432)

## docker-compose.yml
---
version: '2'
services:
  zookeeper:
    image: confluentinc/cp-zookeeper
    hostname: zookeeper
    extra_hosts:
    - "moby:127.0.0.1"
    ports:
      - "2181:2181"

## geo.ts
/**
 * Convert RD (Rijksdriehoek) coordinates to WGS84 and vice versa.
 * @see https://thomasv.nl/2014/03/rd-naar-gps/
 */
const projectionBetweenRdWgs84 = () => {
  const x0 = 155000;
  const y0 = 463000;
  const f0 = 52.15517440; // f => phi
  const l0 = 5.38720621;  // l => lambda

## cachify.ts
/**
 * Create a cached version of a function.
 *
 * @example cachedCalcArea = cachify(calcArea);
 * @param fn Function whose results you want to cache
 * @see TypeScript version of https://dev.to/kepta/javascript-underdogs-part-1---the-weakmap-4jih
 */
export const cachify = <T extends object, R>(fn: (arg: T) => R) => {
  const cache = new WeakMap(); // Use Map() when dealing with non-object arguments
  return (arg: T) => {

## index.html
<!--
  Source:  https://gist.github.com/erikvullings/41be28677574fd484b43e91413a7e45d
  Preview: https://bl.ocks.org/erikvullings/41be28677574fd484b43e91413a7e45d
-->
<!DOCTYPE html>

<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>

## deep-copy.ts
/**
 * Deep copy function for TypeScript.
 * @param T Generic type of target/copied value.
 * @param target Target value to be copied.
 * @see Source project, ts-deepcopy https://github.com/ykdr2017/ts-deepcopy
 */
export const deepCopy = <T>(target: T): T => {
  if (target === null) {
    return target;
  }
	// Use Gists to store code you would like to remember later on
	console.log(window); // log the "window" object to the console
	# Example of a simple scheduler in Elixir
	# Source code from the book Programming Elixir
	# See: https://pragprog.com/book/elixir/programming-elixir
	#
	# Start iex
	# $ iex
	# > c("scheduler.exs")
	# > Scheduler.run(12, FibSolver, :fib, [38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38])

	defmodule Scheduler do
	# Fast Fibonacci implementation (using a Map to cache previous results)
	# This code comes from a mailing-list post by José Valim.
	#
	# Run iex
	# $ iex
	# > c("fib_agent.exs")
	# > { :ok, agent } = FibAgent.start_link()
	# > IO.puts FibAgent.fib(agent, 38)

	defmodule FibAgent do
	# Phoenix, by default, uses a Postgres database, so start one via docker
	docker pull postgres
	# Expose it on port 8432
	docker run -p 8432:5432 --name hello-postgres -e POSTGRES_PASSWORD=postgres -d postgres

	# Install Erlang, Elixir, and now Phoenix
	mix archive.install https://github.com/phoenixframework/archives/raw/master/phx_new.ez
	# Create a new Phoenix app
	mix phx.new hello
	# Edit config/dev.exs and update your hostname. Add a port (default is 5432, but I've mapped it to 8432)
	---
	version: '2'
	services:
	zookeeper:
	image: confluentinc/cp-zookeeper
	hostname: zookeeper
	extra_hosts:
	- "moby:127.0.0.1"
	ports:
	- "2181:2181"
	/**
	* Convert RD (Rijksdriehoek) coordinates to WGS84 and vice versa.
	* @see https://thomasv.nl/2014/03/rd-naar-gps/
	*/
	const projectionBetweenRdWgs84 = () => {
	const x0 = 155000;
	const y0 = 463000;
	const f0 = 52.15517440; // f => phi
	const l0 = 5.38720621; // l => lambda
	/**
	* Create a cached version of a function.
	*
	* @example cachedCalcArea = cachify(calcArea);
	* @param fn Function whose results you want to cache
	* @see TypeScript version of https://dev.to/kepta/javascript-underdogs-part-1---the-weakmap-4jih
	*/
	export const cachify = <T extends object, R>(fn: (arg: T) => R) => {
	const cache = new WeakMap(); // Use Map() when dealing with non-object arguments
	return (arg: T) => {
	<!--
	Source: https://gist.github.com/erikvullings/41be28677574fd484b43e91413a7e45d
	Preview: https://bl.ocks.org/erikvullings/41be28677574fd484b43e91413a7e45d
	-->
	<!DOCTYPE html>

	<head>
	<meta charset="utf-8">
	<script src="https://d3js.org/d3.v4.min.js"></script>
	<style>
	/**
	* Deep copy function for TypeScript.
	* @param T Generic type of target/copied value.
	* @param target Target value to be copied.
	* @see Source project, ts-deepcopy https://github.com/ykdr2017/ts-deepcopy
	*/
	export const deepCopy = <T>(target: T): T => {
	if (target === null) {
	return target;
	}