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to Word Count in the Clojure Track

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 [phrase]
  (frequencies (map str/lower-case (re-seq #"\p{L}+" phrase))))

What can you learn from this solution?

A huge amount can be learnt from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.

Here are some questions to help you reflect on this solution and learn the most from it.

  • What compromises have been made?
  • Are there new concepts here that I could read more about to develop my understanding?