Tim Fogarty tfogo

JS Talk for HackSoc

1995 LiveScript released for NetScape Navigator. It was a language designed to by easy for non-programmers and to add cool dynamic functionality to websites. It ran in the web browser. These days all web browsers have JavaScript engines built in because it is the de facto scripting language of the web. Its name was quickly changed to JavaScript as a marketing ploy because Java was a very hot language at the time. But it has nothing to do with Java. The only thing it has in common is syntax because both languages have syntax based on C.

1996 JavaScript standardized by ECMA. The standard is called ECMAScript

JavaScript used to be famous for being really slow, but because of how important it is to dynamic web pages, companies like Google and Mozilla have sunk a tonne of money into making it faster. These days it's pretty fast and isn't only used in web browsers (see Node.js).

Language Basics for Beginners

The videos are on the machine at the end of the hotdesk area in the MRL. The machine should be on and an ubuntu VM should be running. If not, please start the VM using VirtualBox.

Check that /media/sf_marathon/videos/ exists and contains all the marathon videos. If this isn't the case, you'll have to share C:\marathon with the guest OS using VirtualBox. Make sure the directory /media/sf_marathon/videos/output exists. If it does not, create it.

Change to the video annotator's directory.

$ cd ~/p/video-annotator

Pull the branch origin/server from https://github.com/tfogo/video-annotator.git

	shh such algorithm

	so commander as cat

	plz cat.option with '-n, --number <n>' 'many number' parseInt

	plz cat.parse with process.argv

	such doge much nice
	rly nice<1

	void foo(int a) { // 1 is copied to another space in memory when foo() is called
	// do something
	}

	int main() {
	int a = 1; // 1 is now in memory
	foo(a);
	}

	var mongoose = require('mongoose')
	, Podcast = mongoose.model('Podcast');

	Podcast.find({}).remove(function() {
	Podcast.create({
	title: 'Joe Rogan',
	score: 4783,
	tags: ['tag1', 'tag2', 'tag3'],
	dateSubmitted: new Date
	}, {

	How to convert a video file to an animated GIF on Linux:

	Install required software:
	apt-get install ffmpeg gifsicle imagemagick:
	Convert the video file to a series of small images:
	mkdir /tmp/gif/
	ffmpeg -i YOURVIDEOFILE.mp4 -r 10 /tmp/gif/out%04d.gif
	Combine these images together into a GIF animation:
	gifsicle –delay=10 –loop /tmp/gif/*.gif > animation.gif
	Optimise the GIF animation so the file size is smaller:

	#!/bin/bash
	FILES=/home/tim/Videos/marathon-vids/*.mp4
	for f in $FILES
	do
	time="$(avprobe "$f" 2>&1 >/dev/null \| grep -Po '(?<=Duration:\s)\d{2}:\d{2}:\d{2}')"
	hrs="$(echo "$time" \| grep -Po '\d{2}(?=:\d{2}:\d{2})')"
	mins="$(echo "$time" \| grep -Po '(?<=\d{2}:)\d{2}(?=:\d{2})')"
	secs="$(echo "$time" \| grep -Po '(?<=\d{2}:\d{2}:)\d{2}')"
	filename="$(echo "$f" \| grep -Po '(?<=/home/tim/Videos/marathon-vids/).*(?=\.mp4)')"
	let time=$hrs3600+$mins60+$secs

	var mongoose = require('mongoose');

	// config
	var config = require('./config');

	// mongodb URI
	var uristring = config.db;

	// connect to db
	mongoose.connect(uristring);