Jani Halinen janih

Hello software developers,

Please check your code to ensure you're not making one of the following mistakes related to cryptography.

I. General Mistakes

Writing your own home-grown cryptography primitives (For example: Mifare Classic)
- Exception: For the sake of learning, but don't deploy it in production.
Using a fast hash function (e.g. MD5, SHA256) for storing passwords. Use bcrypt instead.
Not using a cryptographically secure random number generator

Getting started with front-end development

Books should be available in Siili library, also in dead-trees format. Some of the sites are paywalled but worth it, so prefer these over free copies. If something is missing, please have it bought.

Thinking and concepts

Responsive Web Design by A Book Apart
Mobile First by A Book Apart
Prototyping by Rosenfeld Media

Workflows and tools

To get you started without scary tool installs and command line interface, you can use Prepros.io to play with modern web development workflow, packaged in one app.

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

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JDK 8 Released

Most of us won’t be able to use/deploy JDK 8 in production for a looong time. But that shouldn’t stop us from using it, right?

It should be possible to sneak in JDK 8 in the back way, the same way we snuck in Groovy and other libraries we wanted to use.

The Test Suite to the rescue

The Maven compiler plugin run in two separate lifecycles, compile and testCompile. Those can be configured separately.

For {"hello":"world"} from http://localhost:8080/json/resources/greetings

http://www.adam-bien.com/roller/abien/entry/hello_javaee_7_with_maven

https://github.com/AdamBien/javaee7-essentials-archetype

http://search.maven.org/#search|ga|1|a%3A%22javaee7-essentials-archetype%22

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	package fi.luotocompany.logger;

	import java.time.LocalDateTime;
	import java.time.format.DateTimeFormatter;

	/**
	* Simple and secure logger by Kimmo Wikman, Luoto Company
	*/
	public class SimpleLogger {

	// Future versions of Hyper may add additional config options,
	// which will not automatically be merged into this file.
	// See https://hyper.is#cfg for all currently supported options.

	module.exports = {
	config: {
	// default font size in pixels for all tabs
	fontSize: 14,

	// font family with optional fallbacks

	import time
	import win32api, win32con

	VK_CODE = {'left_arrow':0x25,
	'spacebar':0x20,
	'right_arrow':0x27}

	def press(x):
	win32api.keybd_event(VK_CODE[x], 0,0,0)
	win32api.keybd_event(VK_CODE[x],0 ,win32con.KEYEVENTF_KEYUP ,0)