This document discusses the author's first Clojure project and provides resources and techniques for developing with Clojure. It covers setting up the development environment in Emacs, building the backend with Luminus and HugSQL, developing the frontend with React and Om, and comparing object-oriented Java code to Clojure's functional approach. Recommendations are provided for learning Clojure, designing applications, and integrating Clojure code with other technologies like Swagger and Docker.

1. JAVA DEVELOPERS
FIRST CLOJURE PROJECT
CRAIG MALONE

2. OVERVIEW
CLOJURE PROJECT

3. OVERVIEW
WHAT / WHY
▸ Clojure project overview
▸ Perspective of a Java developer
▸ Feedback

4. OVERVIEW
CONTEXT
▸ Target niche market

5. OVERVIEW
CONTEXT
▸ Target niche market
▸ Quilting patterns

6. OVERVIEW
CONTEXT
▸ Target niche market
▸ Quilting patterns
▸ Pattern design tool
▸ Pattern marketplace
▸ Interactive patterns

7. RESOURCES
LEARNING CLOJURE

8. RESOURCES
BOOKS, NEWSLETTERS, VIDEOS
▸ Book: Joy of Clojure

9. RESOURCES
BOOKS, NEWSLETTERS, VIDEOS
▸ Book: Joy of Clojure
▸ Book: Clojure Applied

10. RESOURCES
BOOKS, NEWSLETTERS, VIDEOS
▸ Book: Joy of Clojure
▸ Book: Clojure Applied
▸ Book: Functional Programming Patterns in
Scala and Clojure

11. RESOURCES
BOOKS, NEWSLETTERS, VIDEOS
▸ Book: Joy of Clojure
▸ Book: Clojure Applied
▸ Book: Functional Programming Patterns in
Scala and Clojure
▸ Newsletter: Purely Functional - Eric
Normand

12. RESOURCES
BOOKS, NEWSLETTERS, VIDEOS
▸ Book: Joy of Clojure
▸ Book: Clojure Applied
▸ Book: Functional Programming Patterns in
Scala and Clojure
▸ Newsletter: Purely Functional - Eric
Normand
▸ Newsletter: REPL - Daniel Compton

13. RESOURCES
BOOKS, NEWSLETTERS, VIDEOS
▸ Book: Joy of Clojure
▸ Book: Clojure Applied
▸ Book: Functional Programming Patterns in
Scala and Clojure
▸ Newsletter: Purely Functional - Eric
Normand
▸ Newsletter: REPL - Daniel Compton
▸ Videos: Rich Hickey, David Nolen

14. RESOURCES
BOOKS, NEWSLETTERS, VIDEOS
▸ Book: Joy of Clojure
▸ Book: Clojure Applied
▸ Book: Functional Programming Patterns in
Scala and Clojure
▸ Newsletter: Purely Functional - Eric
Normand
▸ Newsletter: REPL - Daniel Compton
▸ Videos: Rich Hickey, David Nolen
▸ Videos: Clojure/West, Clojure/Conj,
EuroClojure, StrangeLoop

15. DEV ENV
PROJECT SETUP

16. DEVELOPMENT ENVIRONMENT
LANGUAGE
▸ Clojure for microservices

17. DEVELOPMENT ENVIRONMENT
LANGUAGE
▸ Clojure for microservices
▸ ClojureScript in Web SPA

18. DEVELOPMENT ENVIRONMENT
LANGUAGE
▸ Clojure for microservices
▸ ClojureScript in Web SPA
▸ ClojureScript in React Native
Android and iOS

19. DEVELOPMENT ENVIRONMENT
LANGUAGE
▸ Clojure for microservices
▸ ClojureScript in Web SPA
▸ ClojureScript in React Native
Android and iOS
▸ Clojure/ClojureScript for AWS
Lambda functions

20. DEVELOPMENT ENVIRONMENT
EDITOR
▸ Emacs
▸ prelude bundle
▸ smartparens
▸ cider
▸ clj-refactor
▸ projectile
▸ neotree
▸ outline minor mode
▸ clojure-snippets

21. DEVELOPMENT ENVIRONMENT
TESTING
▸ Unit testing: clojure.test and clj.test

22. DEVELOPMENT ENVIRONMENT
TESTING
▸ Unit testing: clojure.test and clj.test
▸ Generative testing: test.check

23. DESIGN
OO TO FUNCTIONAL

24. DESIGN
DESIGN TECHNIQUES
▸ Business Components

25. DESIGN
DESIGN TECHNIQUES
▸ Business Components
▸ Domain Driven Design

26. DESIGN
DESIGN TECHNIQUES
▸ Business Components
▸ Domain Driven Design
▸ Denotational design

27. DESIGN
DESIGN TECHNIQUES
▸ Business Components
▸ Domain Driven Design
▸ Denotational design
▸ Category theory

28. DESIGN
DESIGN TECHNIQUES
▸ Business Components
▸ Domain Driven Design
▸ Denotational design
▸ Category theory
▸ Patterns

29. DESIGN
NAMESPACES
▸ Namespaces govern and reflect
design

30. DESIGN
NAMESPACES
▸ Namespaces govern and reflect
design
▸ General rules

31. DESIGN
NAMESPACES
▸ Namespaces govern and reflect
design
▸ General rules
▸ Standard names

32. DESIGN
NAMESPACES
▸ Namespaces govern and reflect
design
▸ General rules
▸ Standard names
▸ Namespace type rules

33. DESIGN
NAMESPACES
▸ Namespaces govern and reflect
design
▸ General rules
▸ Standard names
▸ Namespace type rules
▸ Examples

34. DESIGN
NAMESPACES
▸ Namespaces govern and reflect
design
▸ General rules
▸ Standard names
▸ Namespace type rules
▸ Examples

35. DESIGN
EXAMPLE - CRUD WORKFLOW
▸ Reusable CRUD workflow code

36. DESIGN
EXAMPLE - CRUD WORKFLOW
▸ Reusable CRUD workflow code
▸ Java: interfaces, implementation
inheritance

37. DESIGN
EXAMPLE - CRUD WORKFLOW
▸ Reusable CRUD workflow code
▸ Java: interfaces, implementation
inheritance
▸ Clojure: protocols

38. DESIGN
EXAMPLE - CRUD WORKFLOW
▸ Reusable CRUD workflow code
▸ Java: interfaces, implementation
inheritance
▸ Clojure: protocols
▸ Clojure: function maps

39. DESIGN
EXAMPLE - CRUD WORKFLOW

40. DESIGN
EXAMPLE - CRUD WORKFLOW

41. DESIGN
EXAMPLE - RENDER PATTERN
▸ Render different data types to different devices
▸ Java: abstract output device, abstract render methods
▸ Clojure: data transformation from one model to another
▸ Transform in pure domain code, render I/O done on edges
▸ Example code

42. DESIGN
EXAMPLE - RENDER PATTERN

43. DESIGN
EXAMPLE - RENDER PATTERN

44. DESIGN
EXAMPLE - RENDER PATTERN

45. DESIGN
EXAMPLE - RENDER PATTERN

46. SERVER
TECH STACK

47. SERVER
LUMINUS
▸ Collection of clojure libraries

48. SERVER
LUMINUS
▸ Collection of clojure libraries
▸ Some glue code via leiningen template

49. SERVER
LUMINUS
▸ Collection of clojure libraries
▸ Some glue code via leiningen template
▸ compojure-api - RESTful API
▸ hugsql - SQL persistence
▸ migratus - database migration
▸ logback - logging
▸ cprop - edn and environment variable
configuration
▸ mount - component lifecycle
▸ buddy/clauth - OAuth2 authentication

50. SERVER
HUGSQL
▸ Clojure SQL library

51. SERVER
HUGSQL
▸ Clojure SQL library
▸ Embraces SQL syntax

52. SERVER
HUGSQL

53. SERVER
HUGSQL
▸ Clojure SQL library
▸ Embraces SQL syntax
▸ Runtime replacement of values

54. SERVER
HUGSQL

55. SERVER
HUGSQL
▸ Clojure SQL library
▸ Embraces SQL syntax
▸ Runtime replacement of values
▸ Extend the parameter replacement
types in clojure code

56. SERVER
HUGSQL

57. SERVER
HUGSQL
▸ Clojure SQL library
▸ Embraces SQL syntax
▸ Runtime replacement of values
▸ Extend the parameter replacement
types in clojure code
▸ Common CRUD SQL

58. SERVER
HUGSQL

59. SERVER
SWAGGER AND DOCKER
▸ Compure-api generates swagger.json

60. SERVER
SWAGGER AND DOCKER
▸ Compure-api generates swagger.json
▸ Swagger2Markup incorporates
custom workflow documentation

61. SERVER
SWAGGER AND DOCKER
▸ Compure-api generates swagger.json
▸ Swagger2Markup incorporates
custom workflow documentation
▸ Gradle used to generate swagger
doc

62. SERVER
SWAGGER AND DOCKER
▸ Compure-api generates swagger.json
▸ Swagger2Markup incorporates
custom workflow documentation
▸ Gradle used to generate swagger
doc
▸ Gradle used to generate docker
container

63. SERVER
SWAGGER AND DOCKER
▸ Compure-api generates swagger.json
▸ Swagger2Markup incorporates
custom workflow documentation
▸ Gradle used to generate swagger
doc
▸ Gradle used to generate docker
container
▸ Docker customization due to security
code

64. SERVER
JAVA / CLOJURE COMPARISON
▸ Java vs Clojure for "Update User"

65. SERVER
JAVA / CLOJURE COMPARISON
▸ Java vs Clojure for "Update User"
▸ Compare objects vs namespaces

66. SERVER
JAVA / CLOJURE COMPARISON
▸ Java vs Clojure for "Update User"
▸ Compare objects vs namespaces
▸ Compare code

67. CLIENT
TECH STACK

68. CLIENT
UI / UX
▸ React

69. CLIENT
UI / UX
▸ React
▸ Om

70. CLIENT
UI / UX
▸ React
▸ Om
▸ Google's Material Design

71. CLIENT
UI / UX
▸ React
▸ Om
▸ Google's Material Design
▸ Material-ui

72. CLIENT
UI / UX
▸ React
▸ Om
▸ Google's Material Design
▸ Material-ui
▸ cljs-material-ui

73. CLIENT
UI / UX
▸ React
▸ Om
▸ Google's Material Design
▸ Material-ui
▸ cljs-material-ui
▸ Processing

74. CLIENT
UI / UX
▸ React
▸ Om
▸ Google's Material Design
▸ Material-ui
▸ cljs-material-ui
▸ Processing
▸ quil

75. CLIENT
CLJ, CLJS, CLJC
▸ Most code is cljc

76. CLIENT
CLJ, CLJS, CLJC
▸ Most code is cljc
▸ Components are cljs

77. CLIENT
CLJ, CLJS, CLJC
▸ Most code is cljc
▸ Components are cljs
▸ cider/figwheel workflow

78. CLIENT
CLJ, CLJS, CLJC
▸ Most code is cljc
▸ Components are cljs
▸ cider/figwheel workflow
▸ Avoid bulk cljs compilation

79. CLIENT
JAVASCRIPT LIBRARIES
▸ Search cljsjs

80. CLIENT
JAVASCRIPT LIBRARIES
▸ Search cljsjs
▸ Add new cljsjs package

81. CLIENT
JAVASCRIPT LIBRARIES
▸ Search cljsjs
▸ Add new cljsjs package
▸ Foreign libs with js files in project

82. CLIENT
JAVASCRIPT LIBRARIES
▸ Search cljsjs
▸ Add new cljsjs package
▸ Foreign libs with js files in project
▸ Foreign libs module feature

83. SUMMARY
THOUGHTS SO FAR

84. SUMMARY
THOUGHTS
▸ Fun and easy
▸ Persistent data structures and pure functions
▸ OO transition not difficult
▸ Running on JVM and JS platforms is key
▸ Growing the community important