moleike

import Data.List

type Point a = (a,a)

distance :: Floating a => Point a -> Point a -> a
distance (a,b) (c,d) = sqrt ((a-c)^ 2 + (b-d)^ 2)

min_distance_naive :: (Ord a, Floating a) => [Point a] -> a
min_distance_naive = foldr1 min . loop
  where

moleike

A quick overview of the node.js streams interface with basic examples.

This is based on @brycebaril's presentation, Node.js Streams2 Demystified

Overview

Streams are a first-class construct in Node.js for handling data.

Think of them as as lazy evaluation applied to data.

moleike

(*
   Interactive approach
   --------------------

   You can copy-paste code into `utop`, provided you load the lwt.unix
   package:

     #use "topfind";;
     #require "lwt.unix";;

moleike

//-------------------------------------------------------------
//
// Hypothesis:
//
// Promises/A is a Monad
//
// To be a Monad, it must provide at least:
// - A unit (aka return or mreturn) operation that creates a corresponding
//   monadic value from a non-monadic value.
// - A bind operation that applies a function to a monadic value

moleike

• https://codewords.recurse.com/issues/one/type-systems-and-logic
• http://lambda-the-ultimate.org/node/1892
• http://www.cse.chalmers.se/edu/year/2012/course/DAT150/lectures/plt-book.pdf
• http://purelytheoretical.com/sywtltt.html
• http://www.cs.cmu.edu/~fp/courses/15317-f09/
• http://gallium.inria.fr/~xleroy/mpri/2-4/

Programming Language Zoo

• https://realworldocaml.org/v1/en/html/parsing-with-ocamllex-and-menhir.html

moleike

# Install ARCH Linux with encrypted file-system and UEFI
# The official installation guide (https://wiki.archlinux.org/index.php/Installation_Guide) contains a more verbose description.

# Download the archiso image from https://www.archlinux.org/
# Copy to a usb-drive
dd if=archlinux.img of=/dev/sdX bs=16M && sync # on linux

# Boot from the usb. If the usb fails to boot, make sure that secure boot is disabled in the BIOS configuration.

# Set swedish keymap

moleike

const net = require('net');

const server = net.createServer((c) => {
  // 'connection' listener
  console.log('client connected');
  c.on('end', () => {
    console.log('client disconnected');
  });
  c.write('hello');
  c.pipe(c);

moleike

input {
  lumberjack {
    # The port to listen on
    port => 5043

    # The paths to your ssl cert and key
    ssl_certificate => "/etc/pki/tls/certs/logstash-forwarder/logstash-forwarder.crt"
    ssl_key => "/etc/pki/tls/private/logstash-forwarder/logstash-forwarder.key"
    
    # default type, but this will already be set by logstash-forwarder anyways

moleike

Understanding the Memory Layout of Linux Executables

Required tools for playing around with memory:

• hexdump
• objdump
• readelf
• xxd
• gcore

moleike

obj-m += tcp_svr_sample.o
 
all:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
 
clean:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clea