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

andrewfgarrison's solution

to Pangram in the JavaScript Track

Published at Jun 24 2020 · 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.

Setup

Go through the setup instructions for Javascript to install the necessary dependencies:

https://exercism.io/tracks/javascript/installation

Requirements

Install assignment dependencies:

$ npm install

Making the test suite pass

Execute the tests with:

$ npm test

In the test suites all tests but the first have been skipped.

Once you get a test passing, you can enable the next one by changing xtest to test.

Source

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

Submitting Incomplete Solutions

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

pangram.spec.js

import { isPangram } from './pangram';

describe('Pangram()', () => {
  test('empty sentence', () => {
    expect(isPangram('')).toBe(false);
  });

  xtest('perfect lower case', () => {
    expect(isPangram('abcdefghijklmnopqrstuvwxyz')).toBe(true);
  });

  xtest('only lower case', () => {
    expect(isPangram('the quick brown fox jumps over the lazy dog')).toBe(true);
  });

  xtest("missing the letter 'x'", () => {
    expect(isPangram('a quick movement of the enemy will jeopardize five gunboats')).toBe(false);
  });

  xtest("missing the letter 'h'", () => {
    expect(isPangram('five boxing wizards jump quickly at it')).toBe(false);
  });

  xtest('with underscores', () => {
    expect(isPangram('the_quick_brown_fox_jumps_over_the_lazy_dog')).toBe(true);
  });

  xtest('with numbers', () => {
    expect(isPangram('the 1 quick brown fox jumps over the 2 lazy dogs')).toBe(true);
  });

  xtest('missing letters replaced by numbers', () => {
    expect(isPangram('7h3 qu1ck brown fox jumps ov3r 7h3 lazy dog')).toBe(false);
  });

  xtest('mixed case and punctuation', () => {
    expect(isPangram('"Five quacking Zephyrs jolt my wax bed."')).toBe(true);
  });

  xtest('case insensitive', () => {
    expect(isPangram('the quick brown fox jumps over with lazy FX')).toBe(false);
  });
});
const ALPHABET = [...'abcdefghijklmnopqrstuvwxyz'];

export const isPangram = (str) => {
  return ALPHABET.every(element => str.toLowerCase().includes(element));
};

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?