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
...and more.
Imagination
(v1.0)
TC39
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 kinda big
Start embracing it!
- Understanding ECMAScript 6 - by Nicholas Zakas
- Exploring ES6 - Axel Rauschmayer
- YDKJS: ES6 & Beyond - Kyle Simpson
ES5 -> ES4
status: 409 (conflict)
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
Codename Harmony
Not all is lost
The proposal for ES4 had some successors like ActionScript 2.0 and JScript 10.0
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 (forEach, map, reduce, etc)
- JSON
- Object.seal and Object.freeze
- immutable undefined
Some features ES5 introduced:
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 (push, pop ,slice, concat, etc)
- Regular expressions
ES3 introduced:
ES2 -> ES1
Final draft of ES1 was published in 1997
| abstract | do | import | short |
| boolean | double | instanceof | static |
| 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.
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
Netscape Navigator 3.0
Any JavaScript error would open a pop-up.
There was no array or object literals.
The constructor property couldn't be set by assignment
The Number constructor would throw if the parameter could not be converted successfully
Number('some string');If at least one of the operands of the equals operator was Boolean, undefined or Number it will then coerse both operands to Number.
if(new Object() == false) {}
undefined.js
(still in beta - v0.38)
undefined = void jsconfuy;
!!
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 commitee
Resources
"JavaScript at 20" by Brendan Eich
"Virtual Machines, JavaScript and Assembler" by Scott Hanselman
Evolution of JavaScript III
Thanks!
@a0viedo
A fifth of century
By Alejandro Oviedo García
A fifth of century
A short overview of the history of JavaScript.
