submisson

src/structured_data.clj

@@ -1,114 +1,129 @@
 (ns structured-data)
 
 (defn do-a-thing [x]
-  :-)
+  (let [xx (+ x x)]
+    (Math/pow xx xx)
+    ))
 
 (defn spiff [v]
-  :-)
+  (+ (get v 0) (get v 2)))
 
 (defn cutify [v]
-  :-)
+  (conj v "<3"))
 
 (defn spiff-destructuring [v]
-  :-)
+  (let [[x y z] v]
+    (+ x z)
+    ))
 
 (defn point [x y]
   [x y])
 
 (defn rectangle [bottom-left top-right]
   [bottom-left top-right])
 
-(defn width [rectangle]
-  :-)
+(defn width [[[x1 y1] [x2 y2]]]
+  (- x2 x1))
 
-(defn height [rectangle]
-  :-)
+(defn height [[[x1 y1] [x2 y2]]]
+  (- y2 y1))
 
 (defn square? [rectangle]
-  :-)
+  (= (width rectangle) (height rectangle)))
 
 (defn area [rectangle]
-  :-)
+  (* (width rectangle) (height rectangle)))
 
-(defn contains-point? [rectangle point]
-  :-)
+(defn contains-point? [[[rx1 ry1] [rx2 ry2]] [px py]]
+  (and (<= rx1 px rx2) (<= ry1 py ry2))
+  )
 
-(defn contains-rectangle? [outer inner]
-  :-)
+(defn contains-rectangle? [outer [inner1 inner2]]
+  (and (contains-point? outer inner1) (contains-point? outer inner2))
+  )
 
 (defn title-length [book]
-  :-)
+  (count (:title book)))
 
 (defn author-count [book]
-  :-)
+  (count (:authors book)))
 
 (defn multiple-authors? [book]
-  :-)
+  (> (author-count book) 1))
 
 (defn add-author [book new-author]
-  :-)
+  (let [authors (:authors book)
+        new-authors (conj authors new-author)]
+    (assoc book :authors new-authors)
+    ))
 
 (defn alive? [author]
-  :-)
+  (not (contains? author :death-year)))
 
 (defn element-lengths [collection]
-  :-)
+  (map count collection))
 
 (defn second-elements [collection]
-  :-)
+  (let [second (fn [x] (first (rest x)))]
+    (map second collection)))
 
 (defn titles [books]
-  :-)
+  (map :title books))
 
 (defn monotonic? [a-seq]
-  :-)
+  (or (apply <= a-seq)
+    (apply >= a-seq)
+  ))
 
 (defn stars [n]
-  :-)
+  (apply str (repeat n "*")))
 
 (defn toggle [a-set elem]
-  :-)
+  (if (contains? a-set elem) (disj a-set elem) (conj a-set elem)))
 
 (defn contains-duplicates? [a-seq]
-  :-)
+  (> (count a-seq) (count (set a-seq))))
 
 (defn old-book->new-book [book]
-  :-)
+  (assoc book :authors (set (:authors book))))
 
 (defn has-author? [book author]
-  :-)
+  (contains? (:authors book) author))
 
 (defn authors [books]
-  :-)
+  (apply clojure.set/union (map :authors books)))
 
 (defn all-author-names [books]
-  :-)
+  (set (map :name (authors books))))
 
 (defn author->string [author]
-  :-)
+  (let [date-suffix (if (contains? author :birth-year) (str " (" (:birth-year author) " - " (:death-year author) ")") "")]
+    (str (:name author) date-suffix)))
 
 (defn authors->string [authors]
-  :-)
+  (apply str (interpose ", " (map author->string authors))))
 
 (defn book->string [book]
-  :-)
+  (str (:title book) ", written by " (authors->string (:authors book))))
 
 (defn books->string [books]
-  :-)
+  (let [num-books (count books)
+        book-str (cond (== num-books 0) "No books" (== num-books 1) "1 book. " :else (str num-books " books. "))]
+    (str book-str (apply str (interpose ". " (map book->string books))) ".")))
 
 (defn books-by-author [author books]
-  :-)
+  (filter (fn [book] (has-author? book author)) books))
 
 (defn author-by-name [name authors]
-  :-)
+  (first (filter (fn [author] (= name (:name author))) authors)))
 
 (defn living-authors [authors]
-  :-)
+  (filter alive? authors))
 
 (defn has-a-living-author? [book]
-  :-)
+  (not (empty? (living-authors (:authors book)))))
 
 (defn books-by-living-authors [books]
-  :-)
+  (filter has-a-living-author? books))
 
 ; %________%