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4d47's solution

to Pangram in the JavaScript Track

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

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

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

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

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

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

  xtest('upper and lower case versions of the same character should not be counted separately', () => {
    expect(isPangram('the quick brown fox jumps over with lazy FX')).toBe(false);
  });

});
export default class {
  constructor(sentence) {
    this.letterSet = new Set(sentence.toLowerCase().match(/[a-z]/g))
  }

  isPangram() {
    return this.letterSet.size == 26
  }
}

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?