Update 06_maps.clj

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Alex Gorelov 2018-03-15 16:02:57 +03:00 committed by GitHub
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@ -2,60 +2,60 @@
(:require [koan-engine.core :refer :all])) (:require [koan-engine.core :refer :all]))
(meditations (meditations
"Don't get lost when creating a map" "Не потеряйтесь при создании хэш-карты"
(= {:a 1 :b 2} (hash-map :a 1 __ __)) (= {:a 1 :b 2} (hash-map :a 1 __ __))
"A value must be supplied for each key" "Каждому ключу — значение"
(= {:a 1} (hash-map :a __)) (= {:a 1} (hash-map :a __))
"The size is the number of entries" "Размер определяется числом пар"
(= __ (count {:a 1 :b 2})) (= __ (count {:a 1 :b 2}))
"You can look up the value for a given key" "Узнать значение можно по ключу"
(= __ (get {:a 1 :b 2} :b)) (= __ (get {:a 1 :b 2} :b))
"Maps can be used as functions to do lookups" "Прямо как функции"
(= __ ({:a 1 :b 2} :a)) (= __ ({:a 1 :b 2} :a))
"And so can keywords" "И ключи тоже"
(= __ (:a {:a 1 :b 2})) (= __ (:a {:a 1 :b 2}))
"But map keys need not be keywords" "Ключи — не обязательно ключевые слова"
(= __ ({2010 "Vancouver" 2014 "Sochi" 2018 "PyeongChang"} 2014)) (= __ ({2010 "Vancouver" 2014 "Sochi" 2018 "PyeongChang"} 2014))
"You may not be able to find an entry for a key" "Иногда — ни ключа, ни значения"
(= __ (get {:a 1 :b 2} :c)) (= __ (get {:a 1 :b 2} :c))
"But you can provide your own default" "На такой случай можно задать что-нибудь на свой вкус"
(= __ (get {:a 1 :b 2} :c :key-not-found)) (= __ (get {:a 1 :b 2} :c :key-not-found))
"You can find out if a key is present" "Есть ли ключ?"
(= __ (contains? {:a nil :b nil} :b)) (= __ (contains? {:a nil :b nil} :b))
"Or if it is missing" "Или нет"
(= __ (contains? {:a nil :b nil} :c)) (= __ (contains? {:a nil :b nil} :c))
"Maps are immutable, but you can create a new and improved version" "Отображения неизменяемы — с новыми элементами только новые отображения"
(= {1 "January" 2 __} (assoc {1 "January"} 2 "February")) (= {1 "January" 2 __} (assoc {1 "January"} 2 "February"))
"You can also create a new version with an entry removed" "И при удалении элементов возвращается новое отображение"
(= {__ __} (dissoc {1 "January" 2 "February"} 2)) (= {__ __} (dissoc {1 "January" 2 "February"} 2))
"Create a new map by merging" "И при совмещении"
(= {:a 1 :b 2 __ __} (merge {:a 1 :b 2} {:c 3})) (= {:a 1 :b 2 __ __} (merge {:a 1 :b 2} {:c 3}))
"Specify how to handle entries with same keys when merging" "Можно указать как быть со значениями идентичных ключей"
(= {:a 1 :b __ :c 3} (merge-with + {:a 1 :b 1} {:b 1 :c 3})) (= {:a 1 :b __ :c 3} (merge-with + {:a 1 :b 1} {:b 1 :c 3}))
"Often you will need to get the keys, but the order is undependable" "Внутри ничего не сортируется. Сортировка по ключам"
(= (list __ __ __) (= (list __ __ __)
(sort (keys { 2014 "Sochi" 2018 "PyeongChang" 2010 "Vancouver"}))) (sort (keys { 2014 "Sochi" 2018 "PyeongChang" 2010 "Vancouver"})))
"You can get the values in a similar way" "По значениям"
(= (list __ __ __) (= (list __ __ __)
(sort (vals {2010 "Vancouver" 2014 "Sochi" 2018 "PyeongChang"}))) (sort (vals {2010 "Vancouver" 2014 "Sochi" 2018 "PyeongChang"})))
"You can even iterate over the map entries as a seq" "Ключ и значение идут друг за другом"
(= {:a __ :b __} (= {:a __ :b __}
(into {} (into {}
(map (map