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Uploaded byHsuan Fu Lien
The Ideas of Clojure - Things I learn from Clojure
The document summarizes some of the key ideas and philosophies of the Clojure programming language as presented by Randy Lien. Some of the main points covered include: - Clojure focuses on simplicity, empowerment, and expressiveness through features like pure functions, immutability, and consistent syntax. - Clojure allows leveraging existing libraries from Java and JavaScript through its ability to run on the JVM and as ClojureScript. - The REPL-driven development model and immutable persistent data structures make Clojure well-suited for functional programming.
The Ideas of Clojure - Things I learn from Clojure
- 1. THE IDEAS OFCLOJURE JCConf 2015/12/04 Randy Lien Things I learn from Clojure
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- 3. Survey! • Heard Clojure? •Clojure developer? • Enjoy Java development?
- 4. “I don’t knowJava.” – Speaker
- 6. History of programminglanguages
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- 10. Tapestry Dude -https://goo.gl/R5m3am (CC BY-SA 2.0) The Creator of Clojure Rich Hickey
- 11. "Hickey is thenew Messiah of software development. Watch and listen to his talks, and you will understand." – http://bepsays.com/2014/07/08/how-rich-is-rich-hickey/
- 12. Few ideas Iwant to share
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- 14. Philosophy Focus Simplicity Empowerment Pure functions Expressive Practical Clarity Consistency Separation of concerns Concise Direct Interop - The Joy of Clojure
- 15. Philosophy - Simplicity •Pure functions • Immutable • Simple abstractions • defprotocol • deftype
- 16. Philosophy - Focus •Syntax will not bother you • Consistency • Dynamic System • Almost everything defined in Clojure can be redefined (Even while program is running) • Use Macro you can build anything you want to do
- 17. Philosophy - Empowerment •Use Java Virtual Machine • Java is mature and has many libraries • JavaScript is everywhere (ClojureScript)
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- 20. Java + Python+ JavaScript ?
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- 22. Data Types • Integers- 123 • Doubles - 1.23 • Ratios - 1/23 • Strings - "JCConf" • "Double Quotes Only" • Characters - J C
- 23. Data Types (cont.) •Symbols - bar • Keywords - :foo • Booleans - true false • Null - nil • Regex - #"[A-Z0-9._%+-]+@[A-Z0-9.-]+.[A-Z]+"
- 24. Data Structure • Lists- (1 2 3) • Prepend • Vectors - [1 2 3] • Zero indexed. Append • Maps - {:a 1, :b 2, :c "3"} • Key-value pair • Comma will be ignored • Sets - #{1 2 3} • Unique. Unordered
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- 27. Clojure • (+ 12) • (+ 1 2 3) • (into [] 2) General • 1 + 2 • 1 + 2 + 3 • [].push(2)
- 29. Use host libraries- Java
- 30. Use host libraries- JavaScript
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- 33. functions & composition •map, reduce, filter • partial, comp • iterate • repeat, repeatedly • Many built-in functions and you don’t need to create. Just compose it!
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- 36. Values should be… •Value! • operated by functions • time-relative • Immutable
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- 39. Why mutable? • Limitationsof early computers: Small RAM and disk • New information replaces old
- 40. Why immutable? • No resourcelimitation • Persistent data structure • Record - Share the same data • Key to do functional programming • No side effect • atom is mutable
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- 42. REPL ? • Read–Eval–PrintLoop • nREPL (network REPL) • Good for doing TDD • clojure.test • ClojureScript - Browser can connect to nREPL
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- 49. Summary • Clojure isa practical functional programming language • Java and JavaScript are two major languages and Clojure and ClojureScript can run on them • Using REPL in your TDD practices would be helpful • Pure functions and Immutable data structure can make your system stable and easy to reason about
- 50. Summary (cont.) • Clojurehas much better tooling and keep improving it • ClojureScript is hotter than Clojure! • Many companies are using Clojure • booking.com, Yahoo, Puppet, Walmart, twitter, heroku, nubank…etc • STM, transducer, core.asyn
- 51. If you wantto know more… • Living Clojure • The Joy of Clojure • ClojureScript Unraveled • Clojure Applied • Clojure for the Brave and True
- 52. Online resource • http://www.tryclj.com/ •http://www.4clojure.com/
- 54. Worth to watch •Simple Made Easy • Clojure Made Simple • The Value of Values • The Language of the System
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