the-vampiire

Python VS ES6 syntax comparison

Python syntax here : 2.7 - online REPL

Javascript ES6 via Babel transpilation - online REPL

Imports

import math

Directory structure for JavaScript/Node Projects

While the following structure is not an absolute requirement or enforced by the tools, it is a recommendation based on what the JavaScript and in particular Node community at large have been following by convention.

Beyond a suggested structure, no tooling recommendations, or sub-module structure is outlined here.

Directories

lib/ is intended for code that can run as-is
src/ is intended for code that needs to be manipulated before it can be used

How to setup your own CA with OpenSSL

For educational reasons I've decided to create my own CA. Here is what I learned.

First things first

Lets get some context first.

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

Every so often I have to restore my gpg keys and I'm never sure how best to do it. So, I've spent some time playing around with the various ways to export/import (backup/restore) keys.

Method 1

Backup the public and secret keyrings and trust database

cp ~/.gnupg/pubring.gpg /path/to/backups/
cp ~/.gnupg/secring.gpg /path/to/backups/
cp ~/.gnupg/trustdb.gpg /path/to/backups/

or, instead of backing up trustdb...

	1. Install rst2pdf
	- use your package manager (or)
	- pip install rst2pdf (or)
	- easy_install rst2pdf

	2. Add rst2pdf to the list of extensions in conf.py



	extensions = ['rst2pdf.pdfbuilder']

	#add 'node_modules' to .gitignore file

	git rm -r --cached node_modules
	git commit -m 'Remove the now ignored directory node_modules'
	git push origin <branch-name>

	###################
	# compiled source #
	###################
	*.com
	*.class
	*.dll
	*.exe
	*.pdb
	*.dll.config
	*.cache

	/*
	Assuming you have an enum type like this.
	You want to rename 'pending' to 'lodged'
	*/
	CREATE TYPE dispute_status AS ENUM('pending', 'resolved', 'open', 'cancelled');

	BEGIN;

	ALTER TYPE dispute_status ADD VALUE 'lodged';
	UPDATE dispute SET status = 'lodged' WHERE status = 'pending';

	var data = "do shash'owania";
	var crypto = require('crypto');
	crypto.createHash('md5').update(data).digest("hex");