PatrickMcSweeny's solution to Pangram on the JavaScript track

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 = (input) => {
  input = input.toLowerCase();
  return alphabet.split("").every(function(letter) {
    return input.includes(letter);
  });
};

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PatrickMcSweeny's solution

to Pangram in the JavaScript Track