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History

Year	JavaScript	jScript	ES	ES Additions
96	1.0, 1.1	1.0	1
97	1.2	3.0	1	(1st Edition)
98	1.3
99		5.0, 5.1	2	(Editorial changes only)
00	1.5	5.5	3	RegExp, Try/Catch, standardized the switch statement
01		5.6

paleo9

javascript

linter

arch only seems to use eslint, but I haven't been able to set it up to use a local copy of eslint. according to 'something I read somewhere', eslint is best used locally, it can be problematic if a global copy is used. Using local means having it in package.json, npm init and eslint init. Older documents refer to using 'npm run eslint', newer docs refer to 'npx eslint'.

running eslint

I am able to run this from the shell, 'npx eslint myfile.js' but never from vim nor atom. Only by installing eslint globally have I been successful.

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PHP Memcached

PHP Sessions don't work on clusters, memcached provides a solution. The procedure is as follows:

create a new Memcached object
call memcached::addServer
retrieve the value with memcached::get
if the value was retrieved successfully
 carry on

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PHP Debugging

At the time of writng I am using Debian Testing (stretch). The php-xdebug package has php7.0 as a dependency so it will be installed by default.

Installation

apt-get install php-xdebug

Using with Vim

The vdebug plugin requires python support in vim, but the version supplied by Debian

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PHP Profiling with XDebug Profiler

Profiling shows up any bottlenecks in a program, it gives real metrics that can be analysed. Looking at the code and making educated guesses at the problem areas is usually ineffectual.

We need to profile the whole user experience so that it includes complex JavaScript and external effects due to latency and distance, load balancers and so on. Usefule tools may be Graphite, LogStash. But that's for another article. Here I am just dealing with backend.

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Basic routing

most defined in app/routes. Simplest consist of a URI and a callback.

Basic GET

Route::get('/', function()
{
 return 'Hello World';

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Wordpress Plugins

Plugins are typically PHP files that add functionality. Located under wordpress/wp-content/plugins.

A Minimal plugin

wordpress/wp-content/minimal.php

  <?php
 /*

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Integrating Xen 4.2 AUR with Systemd.
=================================

I tested the AUR package with a fresh installation of Arch of x86_64. Only 
packages 'base', 'base-devel'and the dependencies mentioned on the site 
were installed.
  * package build also requires dev86
  * dev86 is in multilib, x86_64 users need to enable multilib in /etc/pacman.conf 

  * users need to add a new entry to their bootloader config file   (mentioned)