Learn Clojure 14 Destructuring Clojure Koans Walkthrough in Light Table IDE

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Watch the rest: https://slatteryjim.github.io/Clojure... • This video introduces destructuring, which provides a concise way to initialize multiple variables with values from a complex structure. It is also called abstract structural binding , destructuring bind or destructuring assignment. We'll learn how it can help us make our code more elegant. • The Clojure Koans Walkthrough screencast tutorial helps you learn the Clojure programming language. Experience the joy of Clojure in the Light Table IDE as we tour through the Clojure Koans, taking you all the way from Beginner to Intermediate to Advanced. • Clojure Koans: http://clojurekoans.com/ • On Github: https://github.com/functional-koans/c... • Light Table IDE: http://www.lighttable.com/ • Here is the 14_destructuring.clj source code: • (def test-address • {:street-address 123 Test Lane • :city Testerville • :state TX }) • (meditations • Destructuring is an arbiter: it breaks up arguments • (= __ ((fn [[a b]] (str b a)) • [:foo :bar])) • Whether in function definitions • (= (str First comes love, • then comes marriage, • then comes Clojure with the baby carriage ) • ((fn [[a b c]] __) • [ love marriage Clojure ])) • Or in let expressions • (= Rich Hickey aka The Clojurer aka Go Time aka Macro Killah • (let [[first-name last-name aliases] • (list Rich Hickey The Clojurer Go Time Macro Killah )] • __)) • You can regain the full argument if you like arguing • (= {:original-parts [ Steven Hawking ] :named-parts {:first Steven :last Hawking }} • (let [[first-name last-name :as full-name] [ Steven Hawking ]] • __)) • Break up maps by key • (= 123 Test Lane, Testerville, TX • (let [{street-address :street-address, city :city, state :state} test-address] • __)) • Or more succinctly • (= 123 Test Lane, Testerville, TX • (let [{:keys [street-address __ __]} test-address] • __)) • All together now! • (= Test Testerson, 123 Test Lane, Testerville, TX • (___ [ Test Testerson ] test-address))) • Clojure is a Lisp created by Rich Hickey that runs on the JVM, as an alternative to Java. ClojureScript can target the web browser environment, and node.js, by compiling down to JavaScript, using the Google Closure compiler. Clojure features immutability, functional programming, and being a Lisp, macros.

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