Alejandro Oviedo García
Alejandro is a developer who loves learning new things. He is passionate about education, electronics, Open Source, and community-driven events.
A fifth of century
About me
I like dogs
JavaScript developer
Member of NodeBots Buenos Aires and NodeSchool Buenos Aires
What we will talk about
ECMAScript 2015 (aka version 6)
ECMAScript 5
...
ECMAScript 1
Before the beginning
How the process changed
ES2015 -> ES5
Classes
Arrow functions
Iterators (and generators)
Proxies
Destructuring
let and const
and many more
ES2015 is quite big
Start embracing it!
- Understanding ECMAScript 6 - by Nicholas Zakas
- Exploring ES6 - Axel Rauschmayer
- YDKJS: ES6 & Beyond - Kyle Simpson
ES5 -> ES4
404 - not found
aka JavaScript v2
"ES4 was so large and so innovative that there were doubts about whether it could be successfully specified and implemented."
Douglas Crockford
ES5 -> ES4 ES3
Final draft of ES3 was published on 1999.
Final draft of ES5 was published on 2009.
2006 - First release of jQuery
2006 - AJAX is standardized by the W3C
2004 - Release of Gmail
2000 - End of the world
- strict mode
- getters and setters
- Higher order array methods
- JSON
- Object.seal and Object.freeze
- immutable undefined
ES5 introduced:
(function (){ undefined=1;})();
alert(undefined == 1); // true
ES3 -> ES2
Final draft of ES2 was published in 1998
- try/catch
- strict comparison
- instanceof
- fn.apply
- switch
- function expressions
- Array helpers (slice, splice, concat, etc)
ES3 introduced:
| abstract | do | import | short |
| boolean | double | instanceof | super |
| byte | enum | int | super |
| case | export | interface | switch |
| catch | extends | long | synchronized |
| char | final | native | throw |
| class | finally | package | throws |
| const | float | private | transient |
| debugger | goto | protected | try |
| default | implements | public | volatile |
ES2 future reserved words
Out of 40 future reserved words in ES2, 38 are also a Java keyword.
ES2 -> ES1
Final draft of ES1 was published in 1997
ES1 -> Mocha
The night is dark and full of terrors.
JavaScript is created in May 1995 by Brendan Eich
Other things happening in 1995: invention of Java, Ruby and PHP
Any JavaScript error would open a pop-up.
There was no array and object literals.
The constructor property couldn't be set by assignment
Lets polyfill:
undefined=void meetup.js;if (typeof Object.create != 'function') {
Object.create = Function('o',
'var F = Function();' +
'F.prototype = o;return new F();');
}ES2016 and beyond
Releases shipping yearly
non browser vendor based commitee
Open committee
Resources
"JavaScript at 20" by Brendan Eich
"Virtual Machines, JavaScript and Assembler" by Scott Hanselman
Evolution of JavaScript III
Thanks!
@a0viedo
Un quinto de JS
By Alejandro Oviedo García
