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to Pangram in the JavaScript Track

Published at Jul 13 2018 · 0 comments
Test suite


This solution was written on an old version of Exercism. The tests below might not correspond to the solution code, and the exercise may have changed since this code was written.

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.


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



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.


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.


import { isPangram } from './pangram';

describe('Pangram()', () => {
  test('empty sentence', () => {

  xtest('recognizes a perfect lower case pangram', () => {

  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', () => {

  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

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