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nihilismus's solution

to Word Count in the Clojure Track

Published at Sep 04 2020 · 0 comments
Instructions
Test suite
Solution

Given a phrase, count the occurrences of each word in that phrase.

For example for the input "olly olly in come free"

olly: 2
in: 1
come: 1
free: 1

Source

This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour.

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

word_count_test.clj

(ns word-count-test
  (:require [clojure.test :refer [deftest is]]
            word-count))

(deftest count-one-word
  (is (= {"word" 1}
         (word-count/word-count "word"))))

(deftest count-one-of-each
  (is (= {"one" 1 "of" 1 "each" 1}
         (word-count/word-count "one of each"))))

(deftest count-multiple-occurrences
  (is (= {"one" 1 "fish" 4 "two" 1 "red" 1 "blue" 1}
         (word-count/word-count "one fish two fish red fish blue fish"))))

(deftest ignore-punctuation
  (is (= {"car" 1, "carpet" 1 "as" 1 "java" 1 "javascript" 1}
         (word-count/word-count "car : carpet as java : javascript!!&@$%^&"))))

(deftest include-numbers
  (is (= {"testing" 2 "1" 1 "2" 1}
         (word-count/word-count "testing, 1, 2 testing"))))

(deftest normalize-case
  (is (= {"go" 3}
         (word-count/word-count "go Go GO"))))
(ns word-count
  (:require [clojure.string :as str]))

(defn word-count [string]
  (->> string
    (str/lower-case)
    (re-seq #"\w+")
    (frequencies)))

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