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:
https://exercism.io/tracks/javascript/installation
Install assignment dependencies:
$ npm install
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
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', () => {
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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