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

NunoSempere's solution

to Pangram in the OCaml Track

Published at Dec 29 2019 · 0 comments
Instructions
Test suite
Solution

Determine if a sentence is a pangram. A pangram (Greek: παν γράμμα, pan gramma, "every letter") is a sentence using every letter of the alphabet at least once. The best known English pangram is:

The quick brown fox jumps over the lazy dog.

The alphabet used consists of ASCII letters a to z, inclusive, and is case insensitive. Input will not contain non-ASCII symbols.

Getting Started

  1. Install the Exercism CLI.

  2. Install OCaml.

  3. For library documentation, follow Useful OCaml resources.

Running Tests

A Makefile is provided with a default target to compile your solution and run the tests. At the command line, type:

make

Submitting Incomplete Solutions

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

Feedback, Issues, Pull Requests

The exercism/ocaml repository on GitHub is the home for all of the Ocaml exercises.

If you have feedback about an exercise, or want to help implementing a new one, head over there and create an issue or submit a PR. We welcome new contributors!

Source

Wikipedia https://en.wikipedia.org/wiki/Pangram

test.ml

(* pangram - 1.4.1 *)
open OUnit2
open Pangram

let ae exp got _test_ctxt = assert_equal ~printer:string_of_bool exp got

let tests = [
  "sentence empty" >::
  ae false (is_pangram "");
  "recognizes a perfect lower case pangram" >::
  ae true (is_pangram "abcdefghijklmnopqrstuvwxyz");
  "pangram with only lower case" >::
  ae true (is_pangram "the quick brown fox jumps over the lazy dog");
  "missing character 'x'" >::
  ae false (is_pangram "a quick movement of the enemy will jeopardize five gunboats");
  "another missing character, e.g. 'h'" >::
  ae false (is_pangram "five boxing wizards jump quickly at it");
  "pangram with underscores" >::
  ae true (is_pangram "the_quick_brown_fox_jumps_over_the_lazy_dog");
  "pangram with numbers" >::
  ae true (is_pangram "the 1 quick brown fox jumps over the 2 lazy dogs");
  "missing letters replaced by numbers" >::
  ae false (is_pangram "7h3 qu1ck brown fox jumps ov3r 7h3 lazy dog");
  "pangram with mixed case and punctuation" >::
  ae true (is_pangram "\"Five quacking Zephyrs jolt my wax bed.\"");
  "upper and lower case versions of the same character should not be counted separately" >::
  ae false (is_pangram "the quick brown fox jumps over with lazy FX");
]

let () =
  run_test_tt_main ("pangram tests" >::: tests)
let alphabet = "abcdefghijklmnopqrstuvwxyz"
;;
let explode s = List.init (String.length s) (String.get s)
;;
let alphabetLetterList = explode alphabet
;;

let is_pangram string =
    let cList = explode (String.lowercase_ascii string) in
    let isInPhrase c = List.mem c cList in (*Is c a member of cList?*)
    not (List.mem false (List.map isInPhrase alphabetLetterList))
;;

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?