Rethinking Enterprise Architectures with Node.js

A Node.js platform is built on top of a few principles. One of these is having a small set of functionalities, leaving the rest to the developers. This rule makes the learning curve as small as possible, and in combination with the same language reduces an amount of time spent on switching between front-end and back-end side. We glorify simplicity, we praise reusability, but the question is - how to really take advantage of them? In this talk, you'll learn why NestJS could increase your productivity and how to unlock your full potential as a JavaScript/TypeScript developer.

Transcript

1. KAMMYSLIWIEC
   RETHINKING ENTERPRISE
   ARCHITECTURES WITH
   NODE.JS
   

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2. KAMMYSLIWIEC
   KAMIL MYŚLIWIEC
   SOFTWARE ENGINEER | NESTJS CREATOR

   @KAMMYSLIWIEC

   

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3. KAMIL MYŚLIWIEC
   SOFTWARE ENGINEER

   @KAMMYSLIWIEC

   

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4. KAMMYSLIWIEC
   NODE.JS
   

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5. KAMMYSLIWIEC
   NODE.JS IS A JAVASCRIPT
   RUNTIME BUILT ON TOP OF
   GOOGLE CHROME'S V8 ENGINE
   

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6. KAMMYSLIWIEC
   WHY NODE.JS?
   

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7. KAMMYSLIWIEC
   LANGUAGE
   

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8. KAMMYSLIWIEC
   PRODUCTIVITY
   

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9. KAMMYSLIWIEC
   REUSABILITY
   

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10. KAMMYSLIWIEC
    COMMUNITY
    

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11. KAMMYSLIWIEC
    JAVASCRIPT
    JAVA
    PYTHON
    C#
    PHP
    0% 17,5% 35% 52,5% 70%
    

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12. KAMMYSLIWIEC
    SIMPLICITY
    

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13. SIMPLICITY IS 

    PREREQUISITE
    FOR RELIABILITY
    

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14. KAMMYSLIWIEC
    NODE.JS IS SIMPLE
    

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15. KAMMYSLIWIEC
    NODE.JS IS SIMPLE?
    

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16. KAMMYSLIWIEC
    SETUP TIME
    1 MINUTE
    

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17. KAMMYSLIWIEC
    2 LINES 

    OF CODE
    

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18. KAMMYSLIWIEC
    const app = require('express')();
    app.listen(3000);
    

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19. KAMMYSLIWIEC
    const app = require('express')();
    app.listen(3000);
    

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20. KAMMYSLIWIEC
    const app = require(‘express')();
    app.get('/', (req, res) =>

    res.send('Hello world'));
    app.listen(3000);
    

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21. KAMMYSLIWIEC
    SIMPLICITY?
    

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22. KAMMYSLIWIEC
    COMPLEXITY
    LINES OF CODE
    y = x
    

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23. KAMMYSLIWIEC
    COMPLEXITY
    LINES OF CODE
    y = ex
    

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24. KAMMYSLIWIEC
    NODE.JS IS SIMPLE

    UP TO A CERTAIN POINT
    

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25. KAMMYSLIWIEC
    Simplicity
    Lines of code
    y = ex
    

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26. KAMMYSLIWIEC
    Simplicity
    Lines of code
    y = ex
    

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27. KAMMYSLIWIEC
    WHY?
    

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28. KAMMYSLIWIEC
    SIMPLICITY
    

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29. KAMMYSLIWIEC
    PROJECTS HEAVILY VARY
    BY PEOPLE’S DESIGN
    DECISIONS
    

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30. KAMMYSLIWIEC
    COMPLEXITY
    LINES OF CODE
    y = ex
    

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31. KAMMYSLIWIEC
    SIMPLICITY
    LINES OF CODE
    y = 1/ex
    

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32. KAMMYSLIWIEC
    SIMPLICITY
    LINES OF CODE
    y = 1/ex
    EXPECTED CURVE
    

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33. RETHINK
    

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34. KAMMYSLIWIEC
    SPLIT IT DOWN
    

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35. KAMMYSLIWIEC
    MIDDLEWARE
    

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36. KAMMYSLIWIEC
    MIDDLEWARE
    CLIENT
    REQUEST
    

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37. KAMMYSLIWIEC
    MIDDLEWARE
    CLIENT
    REQUEST
    MIDDLEWARE
    MIDDLEWARE
    

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38. KAMMYSLIWIEC
    TOO MANY
    RESPONSIBILITIES
    

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39. KAMMYSLIWIEC
    ERROR HANDLING
    ACCESS RESTRICTION
    VALIDATION
    SIDE-EFFECTS
    MUTATION
    

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40. KAMMYSLIWIEC
    SPLIT IT DOWN
    

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41. KAMMYSLIWIEC
    ERROR
    HANDLING
    VALIDATION
    ASYNC

    EFFECTS
    ACCESS

    RESTRICTION
    LOGGING
    MUTATION
    

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42. KAMMYSLIWIEC
    IT IS MISLEADING
    TO CALL THEM IN
    THE SAME WAY
    

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43. KAMMYSLIWIEC
    LOOSE COUPLING
    

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44. KAMMYSLIWIEC
    RELATIONS
    

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45. KAMMYSLIWIEC
    A B
    

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46. KAMMYSLIWIEC
    A B
    C
    

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47. KAMMYSLIWIEC
    DECOUPLE MODULES
    

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48. KAMMYSLIWIEC
    MODULE
    FACADE
    

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49. KAMMYSLIWIEC
    ORGANISE CODE 

    PER FEATURE
    

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50. KAMMYSLIWIEC
    DECOUPLE 

    TRANSFER LAYER
    

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51. KAMMYSLIWIEC
    TRANSFER

    LAYER
    DOMAIN 

    LAYER
    

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52. KAMMYSLIWIEC
    MULTILAYERED 

    ARCHITECTURE?
    

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53. KAMMYSLIWIEC
    CONTROLLER
    DATA

    ACCESS
    

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54. KAMMYSLIWIEC
    app.get(‘/organizations/:id’, (req, res) => {
    Organization.find({ name: 'JsCamp' },
    (err, value) => res.json(value));
    });
    

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55. KAMMYSLIWIEC
    app.get(‘/organizations/:id’, (req, res) => {
    Organization.find({ name: 'JsCamp' },
    (err, value) => res.json(value));
    });
    

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56. KAMMYSLIWIEC
    CONTROLLER
    DATA

    ACCESS
    SERVICE
    

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57. KAMMYSLIWIEC
    ENTITIES
    

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58. KAMMYSLIWIEC
    CONTROLLER
    DATA

    ACCESS
    SERVICE
    DOMAIN

    MODEL
    

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59. KAMMYSLIWIEC
    BE PROGRESSIVE
    

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60. KAMMYSLIWIEC
    app.get('/users', (req, res) => {
    usersService.findAll()
    .then((users) => {
    for (let user of users) {
    delete user.password;
    }
    return users;
    })
    .then((users) => res.json(users));
    });
    

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61. KAMMYSLIWIEC
    app.get('/users', (req, res) => {
    usersService.findAll()
    .then((users) => {
    for (let user of users) {
    delete user.password;
    }
    return users;
    })
    .then((users) => res.json(users));
    });
    

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62. KAMMYSLIWIEC
    app.get('/users', (req, res) => {
    usersService.findAll()
    .then((users) => {
    for (let user of users) {
    delete user.password;
    }
    return users;
    })
    .then((users) => res.json(users));
    });
    

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63. KAMMYSLIWIEC
    app.get('/users', (req, res) => {
    usersService.findAll()
    .then((users) => {
    for (let user of users) {
    delete user.password;
    }
    return users;
    })
    .then((users) => res.json(users));
    });
    

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64. KAMMYSLIWIEC
    @Get('users')
    async findAll() {
    return await this.usersService.findAll()
    .filter(user => !user.isDisabled)
    .map(user => omit(user, 'password'));
    }
    

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65. KAMMYSLIWIEC
    @Get('users')
    async findAll() {
    return await this.usersService.findAll()
    .filter(user => !user.isDisabled)
    .map(user => omit(user, 'password'));
    }
    

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66. KAMMYSLIWIEC
    @Get('users')
    async findAll() {
    return await this.usersService.findAll()
    .filter(user => !user.isDisabled)
    .map(user => omit(user, 'password'));
    }
    

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67. KAMMYSLIWIEC
    TYPES
    

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68. KAMMYSLIWIEC
    TYPES ARE 

    PRICELESS
    

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69. KAMMYSLIWIEC
    TRADE-OFF?
    

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70. KAMMYSLIWIEC
    TYPESCRIPT
    

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71. KAMMYSLIWIEC
    MODULE
    FACADE
    

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72. KAMMYSLIWIEC
    FACADE
    INPUT OUTPUT
    

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73. KAMMYSLIWIEC
    LET’S DRAW 

    CONCLUSIONS
    

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74. KAMMYSLIWIEC
    CLEAN ARCHITECTURE

    

    BOILERPLATE & DESIGN SPECIFICATION

    NOT DEVELOPER-FRIENDLY
    

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75. KAMMYSLIWIEC
    NESTJS
    WWW.NESTJS.COM

    @NESTFRAMEWORK

    

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76. KAMMYSLIWIEC
    WHY?
    

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77. KAMMYSLIWIEC
    WE ARE NOT ANOTHER
    FRAMEWORK
    

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78. KAMMYSLIWIEC
    WE ARE THE OPPOSITE
    

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79. KAMMYSLIWIEC
    LOW ENTRY

    THRESHOLD
    

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80. KAMMYSLIWIEC
    FULLY-FEATURED
    

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81. KAMMYSLIWIEC
    REACTIVE
    

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82. KAMMYSLIWIEC
    COMPATIBILITY
    

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83. KAMMYSLIWIEC
    

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84. KAMMYSLIWIEC
    

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85. KAMMYSLIWIEC
    OPEN SOURCE
    

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86. KAMMYSLIWIEC
    

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87. KAMMYSLIWIEC
    THANK

    YOU
    @KAMMYSLIWIEC
    

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