Upgrade to Pro — share decks privately, control downloads, hide ads and more …

The Dark Side of JavaScript

The Dark Side of JavaScript

Lucas Santos

May 17, 2021
Tweet

More Decks by Lucas Santos

Other Decks in Technology

Transcript

  1. Javascript
    as you never saw before

    View Slide

  2. cloud advocate_
    who am I_
    [email protected]
    {twitter, facebook, linkedin…}.lsantos.dev

    View Slide

  3. The magic JS

    View Slide

  4. Removing Callbacks

    View Slide

  5. The Dark Side of
    Javascript
    JS

    View Slide

  6. Symbols

    View Slide

  7. View Slide

  8. View Slide

  9. View Slide

  10. BUT BE AWARE_

    View Slide

  11. Small usage example

    View Slide

  12. Other usage example in Node.js source code
    bit.ly/nodejs-symbol
    Check it out!

    View Slide

  13. Async Iterators_

    View Slide

  14. View Slide

  15. View Slide

  16. View Slide

  17. View Slide

  18. View Slide

  19. View Slide

  20. View Slide

  21. Promise.finally

    View Slide

  22. View Slide

  23. Promise.allSettled

    View Slide

  24. View Slide

  25. View Slide

  26. Ranges

    View Slide

  27. View Slide

  28. View Slide

  29. View Slide

  30. Readonly properties_

    View Slide

  31. Object.defineProperty

    View Slide

  32. View Slide

  33. Object.defineProperties

    View Slide

  34. ‘age’ hasn’t been shown
    because it’s not
    enumerable

    View Slide

  35. Private class fields_

    View Slide

  36. View Slide

  37. View Slide

  38. Dynamic function creation_

    View Slide

  39. View Slide

  40. View Slide

  41. in operator_

    View Slide

  42. View Slide

  43. View Slide

  44. Dynamic instances by
    reflection_

    View Slide

  45. View Slide

  46. View Slide

  47. View Slide

  48. Bitwise Operators_

    View Slide

  49. AND

    View Slide

  50. View Slide

  51. What!?

    View Slide

  52. A B C D Result
    X 0 1 0 1 5
    Y 0 0 0 1 1
    Z 0 0 0 1 1

    View Slide

  53. String as binary data

    View Slide

  54. OR

    View Slide

  55. View Slide

  56. A B C D Result
    X 0 1 0 1 5
    Y 0 0 0 1 1
    Z 0 1 0 1 5

    View Slide

  57. XOR

    View Slide

  58. View Slide

  59. A B C D Result
    X 0 1 0 1 5
    Y 0 0 0 1 1
    Z 0 1 0 0 4

    View Slide

  60. Cryptography

    View Slide

  61. View Slide

  62. NOT

    View Slide

  63. View Slide

  64. A B C D Resultado
    X 0 1 0 1 5
    Z 1 0 1 0 10

    View Slide

  65. Existence condition

    View Slide

  66. View Slide

  67. SHIFT

    View Slide

  68. View Slide

  69. Multiply and divide

    View Slide

  70. View Slide

  71. refs_
    - imasters.com.br/desenvolvimento/o-lado-escuro-javascript
    - medium.com/trainingcenter/entendendo-promises-de-uma-vez-por-todas-3
    2442ec725c2
    - imasters.com.br/desenvolvimento/campos-publicos-e-privados-em-classes-j
    avascript-o-que-vem-por-ai-no-esnext
    - imasters.com.br/javascript/futuro-das-promises-no-javascript
    - medium.com/trainingcenter/iterators-em-javascript-880adef14495
    - medium.com/trainingcenter/reflection-em-javascript-73fc0e702e2
    - developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objec
    ts/Reflect
    - slides.lsantos.dev/desmistificando-heranca-e-prototipos-no-javascript
    - dev.to/khaosdoctor/entendendo-async-iterators-1opo

    View Slide

  72. thank you_
    info.lsantos.dev

    View Slide