(ns koans.15-destructuring (:require [koan-engine.core :refer :all])) (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 "An Oxford comma list of apples, " "oranges, " "and pears.") ((fn [[a b c]] __) ["apples" "oranges" "pears"])) "Or in let expressions" (= "Rich Hickey aka The Clojurer aka Go Time aka Lambda Guru" (let [[first-name last-name & aliases] (list "Rich" "Hickey" "The Clojurer" "Go Time" "Lambda Guru")] __)) "You can regain the full argument if you like arguing" (= {:original-parts ["Stephen" "Hawking"] :named-parts {:first "Stephen" :last "Hawking"}} (let [[first-name last-name :as full-name] ["Stephen" "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)))