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JavaScript: The Past, Present and Future

Avatar for Kim Joar Bekkelund Kim Joar Bekkelund
April 17, 2015
Programming
160
0

JavaScript: The Past, Present and Future

An introduction to the role of JavaScript. Given to students at NTNU in Trondheim, Norway.

Avatar for Kim Joar Bekkelund

Kim Joar Bekkelund

April 17, 2015

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Transcript

  1. JavaScript The Past, Present and Future

  2. Kim Joar Bekkelund @kimjoar [email protected] Fagleder i JS-plattform Jobbet i

    BEKK siden 2011
  3. None
  4. None

  5. It all started at 1995

  6. Brendan Eich + 10 days = JavaScript

  7. What did we do with this new language? (You really

    don't want to know)

  8. CUT & PASTE

  9. None
  10. None
  11. None

  12. … and this went on for almost 10 years

  13. 2004

  14. 2005

  15. What happened?

  16. What happened?

  17. What happened?

  18. What happened?

  19. JavaScript went from nothing to …

  20. "any application that can be written in JavaScript, will eventually

    be written in JavaScript." Atwood's Law

  21. JavaScript Where are we now?

  22. We expect more!

  23. None
  24. None

  25. SPA Single-page applications

  26. None

  27. 10/90? 50/50? 70/30?

  28. None
  29. None

  30. WebSockets Client Server Set up connection

  31. JavaScript + I/O Single-threaded, non-blocking

  32. None

  33. Node.js in production?

  34. “Assembly language of the web”

  35. None

  36. # 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

  37. 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.

  38. 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

  39. (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

  40. asm.js Speeding up compiled languages

  41. asm.js Speeding up compiled languages "an extraordinarily optimizable, low-level subset

    of JavaScript"

  42. C/C++ -> LLVM -> Emscripten -> asm.js

  43. int f(int i) { return i + 1; } C

    function f(i) { i = i|0; return (i + 1)|0; } asm.js

  44. But what happens when you can run C and C++

    code in the browser?
  45. None
  46. None
  47. None

  48. millions of lines of C compiled to asm.js/JavaScript running in

    a browser !

  49. JavaScript The future

  50. language, apps, ecosystem, VM

  51. LANGUAGE the

  52. ES1 1997 ES2 1998 ES3 1999 ES4 Abandoned ES5 2009

    ES6 2015 ES7 est. 2016

  53. Adjustments based on real-world problems

  54. None

  55. <!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
  56. None

  57. ECOSYSTEM the

  58. None

  59. Cryptography API, Audio API, WebRTC, File API …

  60. 60fps, but only one thread Web Workers 60fps, but only

    one thread
  61. None

  62. from mostly huge frameworks to thousands of small libraries

  63. None

  64. Rendering to …

  65. WebGL

  66. vimeo.com/105880197 javazone webgl

  67. React Native

  68. None
  69. None

  70. APPS the

  71. None
  72. None

  73. offline first

  74. Full-featured online apps

  75. None
  76. None

  77. Desktop and mobile apps

  78. None

  79. chrome os, windows 8, firefox os JavaScript as a first-class

    citizen

  80. We will see more of the backend developers on the

    frontend … and that's a great thing!

  81. VM the

  82. Browser = rendering engine + JavaScript engine

  83. Chakra SpiderMonkey JavaScriptCore V8 Nashorn

  84. Super-competitive market Push for new features and better performance

  85. 2/3 of native speed on benchmarks emscripten + asm.js

  86. None

  87. Want to learn JS?

  88. None
  89. None

  90. Takk for meg!