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45 lines
1.3 KiB
Clojure
45 lines
1.3 KiB
Clojure
(ns koans.15-destructuring
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(:require [koan-engine.core :refer :all]))
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(def test-address
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{:street-address "123 Test Lane"
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:city "Testerville"
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:state "TX"})
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(meditations
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"Destructuring is an arbiter: it breaks up arguments"
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(= __ ((fn [[a b]] (str b a))
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[:foo :bar]))
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"Whether in function definitions"
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(= (str "An Oxford comma list of apples, "
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"oranges, "
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"and pears.")
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((fn [[a b c]] __)
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["apples" "oranges" "pears"]))
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"Or in let expressions"
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(= "Rich Hickey aka The Clojurer aka Go Time aka Lambda Guru"
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(let [[first-name last-name & aliases]
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(list "Rich" "Hickey" "The Clojurer" "Go Time" "Lambda Guru")]
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__))
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"You can regain the full argument if you like arguing"
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(= {:original-parts ["Stephen" "Hawking"] :named-parts {:first "Stephen" :last "Hawking"}}
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(let [[first-name last-name :as full-name] ["Stephen" "Hawking"]]
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__))
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"Break up maps by key"
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(= "123 Test Lane, Testerville, TX"
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(let [{street-address :street-address, city :city, state :state} test-address]
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__))
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"Or more succinctly"
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(= "123 Test Lane, Testerville, TX"
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(let [{:keys [street-address __ __]} test-address]
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__))
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"All together now!"
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(= "Test Testerson, 123 Test Lane, Testerville, TX"
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(___ ["Test" "Testerson"] test-address)))
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