of JavaScript

Дмитрий Воробей

• JavaScript developer
• Руководитель курсов по Front-end в EPAM, Minsk
• Организатор открытых митапов http://rollingscopes.com/

The Rolling Scopes Community

• 700+ members
• 25+ events (meetups, workshops)
• http://rollingscopes.com/
• Conference: http://conf.rollingscopes.com/archive/2015/
• Training for students: http://school.rollingscopes.com/

Back to 1995

1995

• Browser War I
• Microsoft vs Netscape
• Control of the Internet

Brendan Eich

JavaScript creator, Mozilla founder

First version of JavaScript was created in 10 days

May 6-15, 1995

Wat

    A == B
    A == C
    B != C
                    

    0 == ''; // true
    0 =='0'; // true
    '' == '0'; //false
        

Wat

    ["10", "10", "10", "10"].map(parseInt);
    //Output: [10, NaN, 2, 3]
            

Evolution of name

ECMAScript

ECMAScript Philosophy

ECMAScript Philosophy

• No version like python 2 and 3.
• No breaking changes.
• Fully backwards-compatibility.

JavaScript = Java + Scheme (Lisp) + Self (Smalltalk)

2007

Open source wins!

Members of TC39

(Ecma Technical Committee 39)

• Google
• Apple
• eBay
• Mozilla
• Intel
• Microsoft
• Facebook
• ...

Open Browsers

• WebKit/Blink
• Chromium
• Firefox

Open Tools

• Angular/Ember/React/...
• Jasmine/Mocha Test Frameworks
• Grunt/Gulp Task Runner
• Node.js
• Atom IDE
• ....

Client logic

Client logic

Client logic

Внезапно...

• V8 uses JIT (just-in-time) compilation to directly emit machine code at runtime.
• Open source.
• 1,5+ mln lines of code

Nowadays!

If you don't like Java, you can use C#, Ruby, Python and so on

but if you don't like JavaScript

Shut Up and Code!

JavaScript is everywhere

reveal.js - The HTML Presentation Framework

Presentation inside browser

Node.js at PayPal

• Teams between 1/3 to 1/10 of Java teams
• Doubled requests per second
• 35% decrease in average response time
• Lines of code shrunk by factor 3 to 5
• Development twice as fast
• JS both on frontend and backend

Web interfaces

Tessel

Tessel

node-copter

EPAM CEO showcase award 2014

August, 2015

Some project facts:

• Cheap hardware (1,3 Ghz, 1GB )
• Rich UI written in pure JavaScript
• 10+ millions of users in 14 countries
• https://info.epam.com/en/news/official/2015/ceo-showcase-final.html

Emscripten

Unreal Engine

running in a browser

Asm.js

250 KLOC of C compiled to asm.js (port take 5 days) running in a browser at half speed (in 2014)

I

JavaScript

Записаться в Rolling Scopes School можно тут:

https://goo.gl/swTLXa

Спасибо!