Peter Hellberg peterhellberg

💙

Coding Go and Zig

peterhellberg / max_parallelism.go

Created June 24, 2013 07:25

Find out the max value for GOMAXPROCS on your machine.

	package main

	import (
	"fmt"
	"runtime"
	)

	func MaxParallelism() int {
	maxProcs := runtime.GOMAXPROCS(0)
	numCPU := runtime.NumCPU()

peterhellberg / 40_primes.rb

Last active December 19, 2015 22:59

Fun with prime numbers…

	require 'prime'

	# Lets calculate some prime numbers
	primes = 40.times.map { \|n\| n**2+n+41 } #=> 40 prime numbers (41, 43, 47, …, 1523, 1601)

	# Let’s verify that they are in fact all prime numners
	primes == primes.select(&:prime?) #=> true

peterhellberg / .gitconfig

Created July 19, 2013 08:40

A Git alias to display files with a lot of churn. (Inspired by @kytrinyx)

	[alias]
	churn = !git --no-pager log --name-only --oneline \| grep -v ' ' \| sort \| uniq -c \| sort -nr \| head

peterhellberg / switch.lua

Created August 5, 2013 23:56

I just wrote, and _ran_ this little Lua script on my iPad using Codea.

	function setup()
	boolean("Skrivbordslampa", 1)
	boolean("Hörnlampa", 2)
	boolean("Sovrumslampa", 3)
	end

	function boolean(title, n)
	parameter.boolean(title, false, function(b) lamp(n, b) end)
	end

peterhellberg / smith.rb

Last active December 20, 2015 18:58

Monkeypatching Integer in order to find Smith numbers :)

	require 'prime'

	module Smith
	def smith?
	return false if self < 2 \|\| self.prime?
	sum_of_digits == sum_of_prime_factors
	end

	def sum_of_digits
	to_s.split('').map(&:to_i).inject(:+)

peterhellberg / run_remote_code.lua

Created August 19, 2013 21:00

Run remote Lua scripts (from Codea) on your iPad.

	function run_remote_code(url)
	local eval_response = function(data, status, headers)
	if (status == 200) then
	code = string.gsub(data, '"', "'")
	loadstring(code)()
	end
	end

	http.request(url, eval_response)
	end

peterhellberg / screenshot.js

Created September 4, 2013 14:57

Site screenshots with the url-to-screenshot library (using PhantomJS)

	var screenshot = require('url-to-screenshot');
	var fs = require('fs');
	var sys = require('sys')
	var exec = require('child_process').exec;

	if(process.argv[2]) {
	var url = process.argv[2];

	screenshot(url)
	.width(800)

peterhellberg / alphabet.png

Last active December 24, 2015 10:19

Just playing around with the Graph gem.

peterhellberg / acb-cylon.coffee

Last active December 29, 2015 04:09

Cylon robot with two LEDs and a Basic Force Sensing Resistor

	fs = require('fs')

	isUSBModem = (element) ->
	element.match(/^cu.usbmodem\d+/)

	device = fs.readdirSync('/dev').filter(isUSBModem)[0]

	Cylon = require('cylon')

	Cylon.robot

peterhellberg / audio_visualizer.pde

Last active December 29, 2015 07:09

Audio visualizer connected to an Arduino over Firmata