🎉 Exercism Research is now launched. Help Exercism, help science and have some fun at research.exercism.io 🎉
Avatar of marques-work

marques-work's solution

to Anagram in the LFE Track

Published at Jun 02 2020 · 0 comments
Instructions
Test suite
Solution

Given a word and a list of possible anagrams, select the correct sublist.

Given "listen" and a list of candidates like "enlists" "google" "inlets" "banana" the program should return a list containing "inlets".


For installation and learning resources, refer to the exercism help page.

To run the provided tests, you will need make. Open a terminal window and run the following from the exercise directory:

make test

You should now be able to see the results of the test suite for the exercise.

Source

Inspired by the Extreme Startup game https://github.com/rchatley/extreme_startup

Submitting Incomplete Solutions

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

anagram-tests.lfe

(defmodule anagram-tests
  (behaviour ltest-unit)
  (export all))

(include-lib "ltest/include/ltest-macros.lfe")

(deftest no-matches
  (is-equal () (anagram:find "diaper" '("hello" "world" "zombies" "pants"))))

(deftest detect-simple-anagram
  (is-equal '("tan") (anagram:find "ant" '("tan" "stand" "at"))))

(deftest does-not-confuse-different-duplicates
  (is-equal () (anagram:find "galea" '("eagle"))))

(deftest eliminate-angram-subsets
  (is-equal () (anagram:find "good" '("dog" "goody"))))

(deftest detect-anagram
  (is-equal
    '("inlets")
    (anagram:find "listen" '("enlists" "google" "inlets" "banana"))))

(deftest multiple-anagrams
  (is-equal
    '("gallery" "regally" "largely")
    (anagram:find
      "allergy"
      '("gallery" "ballerina" "regally" "clergy" "largely" "leading"))))

(deftest case-insensitive-subject
  (is-equal
    '("carthorse")
    (anagram:find "Orchestra" '("cashregister" "carthorse" "radishes"))))

(deftest case-insensitive-candidate
  (is-equal
    '("Carthorse")
    (anagram:find "Orchestra" '("cashregister" "Carthorse" "radishes"))))

(deftest does-not-detect-a-word-as-its-own-anagram
  (is-equal
    '("cron")
    (anagram:find "corn" '("corn" "dark" "Corn" "rank" "CORN" "cron" "park"))))
(defmodule anagram
  (export (find 2)))

(defun find (subj candidates)
  "finds candidates that are anagrams of the subject"
  (let* ((lowered (string:lowercase subj))
         (hashed (lists:sort lowered)))
    (lists:filter
      (lambda (word)
        (and
          (!= lowered (string:lowercase word))
          (== hashed (lists:sort (string:lowercase word)))))
      candidates))
)

Community comments

Find this solution interesting? Ask the author a question to learn more.

What can you learn from this solution?

A huge amount can be learned 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 you could read more about to improve your understanding?