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Predicate exercises #964

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4 changes: 2 additions & 2 deletions .travis.yml
Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
language: clojure
lein: lein2
script: lein2 midje :config .midje-grading-config.clj
lein: lein
script: lein midje :config .midje-grading-config.clj
jdk:
- openjdk7
notifications:
Expand Down
36 changes: 18 additions & 18 deletions src/predicates.clj
Original file line number Diff line number Diff line change
@@ -1,41 +1,41 @@
(ns predicates)

(defn sum-f [f g x]
:-)
(+ (f x) (g x)))

(defn less-than [n]
:-)
(fn [k] (< k n)))

(defn equal-to [n]
:-)
(fn [k] (== k n)))

(defn set->predicate [a-set]
:-)
(defn set->predicate [a-set] (fn [x] (if (contains? a-set x) true false)))

(defn pred-and [pred1 pred2]
:-)
(defn pred-and [pred1 pred2] (fn [x] (and (pred1 x) (pred2 x))))

(defn pred-or [pred1 pred2]
:-)
(defn pred-or [pred1 pred2] (fn [x] (or (pred1 x) (pred2 x))))

(defn whitespace? [character]
(Character/isWhitespace character))

(defn blank? [string]
:-)
(defn blank? [string] (every? whitespace? string))

(defn has-award? [book award]
:-)
(defn has-award? [book award] (contains? (:awards book) award))

(defn HAS-ALL-THE-AWARDS? [book awards]
:-)
(defn HAS-ALL-THE-AWARDS? [book awards] (every? (fn [x] (has-award? book x)) awards))

(defn my-some [pred a-seq]
:-)
(let [filtered-map (filter (fn [x] (boolean x)) (map pred a-seq))]
(if (< 0 (count filtered-map))
(first filtered-map)
false)))

(defn my-every? [pred a-seq]
:-)
(let [filtered-map (filter (fn [x] (boolean x)) (map pred a-seq))]
(if (== (count filtered-map) (count a-seq)) true false)))

(defn prime? [n]
:-)
(let
[pred (fn [x] (== (rem n x) 0))]
(not (some pred (range 2 n)))))
;^^