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JavaScript: The Past, Present and Future
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Kim Joar Bekkelund
April 17, 2015
Programming
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99
JavaScript: The Past, Present and Future
An introduction to the role of JavaScript. Given to students at NTNU in Trondheim, Norway.
Kim Joar Bekkelund
April 17, 2015
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Transcript
JavaScript The Past, Present and Future
Kim Joar Bekkelund @kimjoar kim.bekkelund@bekk.no Fagleder i JS-plattform Jobbet i
BEKK siden 2011
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It all started at 1995
Brendan Eich + 10 days = JavaScript
What did we do with this new language? (You really
don't want to know)
CUT & PASTE
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… and this went on for almost 10 years
2004
2005
What happened?
What happened?
What happened?
What happened?
JavaScript went from nothing to …
"any application that can be written in JavaScript, will eventually
be written in JavaScript." Atwood's Law
JavaScript Where are we now?
We expect more!
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SPA Single-page applications
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10/90? 50/50? 70/30?
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WebSockets Client Server Set up connection
JavaScript + I/O Single-threaded, non-blocking
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Node.js in production?
“Assembly language of the web”
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# Assignment: number = 42 opposite = true # Conditions:
number = -42 if opposite # Functions: square = (x) -> x * x # Arrays: list = [1, 2, 3, 4, 5] # Objects: math = root: Math.sqrt square: square cube: (x) -> x * square x Inspired by Ruby and Python Several features will be added to the next JS version
class Point { x: number; y: number; constructor(x: number, y:
number) { this.x = x; this.y = y; } getDist() { return Math.sqrt( this.x * this.x + this.y * this.y ); } } var p = new Point(3,4); var dist = p.getDst(); console.log("Hypotenuse is: " + dist); Optional static typing. Superset of JS.
data Person = Person { name :: String, age ::
Number } showPerson :: Person -> String showPerson (Person o) = o.name ++ ", aged " ++ show o.age examplePerson :: Person examplePerson = Person { name: "Bonnie", age: 26 } Inspired by Haskell
(ns example (:require [om.core :as om] [om.dom :as dom])) (defn
widget [data owner] (reify om/IRender (render [this] (dom/h1 nil (:text data))))) (om/root widget {:text "Hello world!"} {:target (. js/document (getElementById "my-app"))}) A Lisp for the browser
asm.js Speeding up compiled languages
asm.js Speeding up compiled languages "an extraordinarily optimizable, low-level subset
of JavaScript"
C/C++ -> LLVM -> Emscripten -> asm.js
int f(int i) { return i + 1; } C
function f(i) { i = i|0; return (i + 1)|0; } asm.js
But what happens when you can run C and C++
code in the browser?
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millions of lines of C compiled to asm.js/JavaScript running in
a browser !
JavaScript The future
language, apps, ecosystem, VM
LANGUAGE the
ES1 1997 ES2 1998 ES3 1999 ES4 Abandoned ES5 2009
ES6 2015 ES7 est. 2016
Adjustments based on real-world problems
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <title>Datainn</title>
<meta name="description" content=""> <meta name="viewport" content="width=device-width"> <script src="../shared/vendor/proj4js/proj4js-compressed.js"></scr <script src="../shared/vendor/bower_components/underscore/undersco <script src="../shared/vendor/bower_components/jquery/jquery.min.j <script src="../shared/vendor/bower_components/spin.js/spin.js"></ <script src="../shared/vendor/bower_components/angular/angular.js" <script src="../shared/vendor/bower_components/angular-route/angul <script src="../shared/vendor/bower_components/angular-animate/ang <script src="../shared/vendor/bower_components/ng-table/ng-table.j <script src="../shared/vendor/bower_components/moment/moment.js">< <script src="../shared/vendor/bower_components/moment/lang/nb.js"> <script src="../shared/vendor/bower_components/based-on/index.js"> <script src="../shared/vendor/bower_components/poller.js/poller.js <script src="../shared/vendor/bower_components/ee.js/ee.js"></scri <script src="../shared/vendor/bower_components/d3/d3.js"></script> <script src="../shared/vendor/bower_components/nvd3/nv.d3.js"></sc
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ECOSYSTEM the
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Cryptography API, Audio API, WebRTC, File API …
60fps, but only one thread Web Workers 60fps, but only
one thread
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from mostly huge frameworks to thousands of small libraries
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Rendering to …
WebGL
vimeo.com/105880197 javazone webgl
React Native
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APPS the
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offline first
Full-featured online apps
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Desktop and mobile apps
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chrome os, windows 8, firefox os JavaScript as a first-class
citizen
We will see more of the backend developers on the
frontend … and that's a great thing!
VM the
Browser = rendering engine + JavaScript engine
Chakra SpiderMonkey JavaScriptCore V8 Nashorn
Super-competitive market Push for new features and better performance
2/3 of native speed on benchmarks emscripten + asm.js
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Want to learn JS?
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Takk for meg!