Shemeikka’s gists

Shemeikka / file.js

Last active October 4, 2016 12:51

factorial and sum of fibonacci(n) using recursion in JavaScript

	const factorial = (n, acc=1) => {
	if (n < 1) { return undefined; }

	if (n === 1) { return acc; }

	return factorial(n-1, n*acc);
	};

	const sumFibonacci = (n, prev=0, next=1, acc=0) => {
	if (n === 0) { return acc; }

Shemeikka / notes.js

Last active September 5, 2016 18:16

Javascript notes

	// Some stuff requires ES6

	// Watch this first
	// Philip Roberts: What the heck is the event loop anyway? \| JSConf EU 2014
	// https://www.youtube.com/watch?v=8aGhZQkoFbQ

	// Then read this
	// https://rainsoft.io/gentle-explanation-of-this-in-javascript/

	// https://strongloop.com/strongblog/higher-order-functions-in-es6easy-as-a-b-c/

Shemeikka / file.js

Created June 14, 2016 08:57

Drag Leaflet.js circle

	// From http://codepen.io/kad3nce/pen/bEdwOE

	var map = L.map('map').setView(center, 13);
	var circle = L.circle(center, 1000).addTo(map);
	circle.on('mousedown', function (event) {
	map.dragging.disable();
	var _circle$_latlng = circle._latlng;
	var circleStartingLat = _circle$_latlng.lat;
	var circleStartingLng = _circle$_latlng.lng;
	var _event$latlng = event.latlng;

Shemeikka / gist:d4c73bd97080614660036af42b58d605

Created May 20, 2016 10:13

Install react development environment with npm

	npm install --save react react-dom
	npm install --save-dev babel webpack webpack-dev-server
	npm install --save-dev babel-core babel-loader babel-preset-es2015 babel-preset-react

Shemeikka / build_go.sh

Last active April 27, 2016 14:29

Building Go 1.6.2 for ARMv5 on ARM using Go 1.4.3

	# Guide http://blog.hypriot.com/post/how-to-compile-go-on-arm/

	# Todo
	# Use named variables for versions
	# Take version as a cmd argument
	# Error handling

	# Download Go 1.4.3 source
	wget https://storage.googleapis.com/golang/go1.4.3.src.tar.gz
	# Extract it

Shemeikka / crc16.ex

Last active April 4, 2016 06:29

CRC16 calculation in Elixir using constant 0xA001

	defmodule CRC16 do
	use Bitwise
	@constant 0xA001

	def calculate(data) do
	crc = 0x0000
	table = init_table()
	:binary.bin_to_list(data)
	\|> Enum.reduce(crc, fn(value, crc) ->
	(crc >>> 8) ^^^ Enum.at(table, (crc ^^^ value) &&& 0x00ff)

Shemeikka / randomstring.go

Created August 19, 2015 05:42

Generates random n sized hex string

	import (
	crand "crypto/rand"
	"math/big"
	)

	// Generates random n sized hex string
	func RandString(n int) string {
	const alphanum = "0123456789ABCDEF"
	symbols := big.NewInt(int64(len(alphanum)))
	states := big.NewInt(0)

Shemeikka / crc16.go

Created July 10, 2015 08:46

CRC16 in Go