[Algorithm] Find The Vowels

发布时间：2020-12-13 23:46:37 所属栏目：Linux 来源：网络整理

导读：? // --- Directions // Write a function that returns the number of vowels // used in a string. Vowels are the characters ‘a‘,‘e‘ // ‘i‘,‘o‘,and ‘u‘. // --- Examples // vowels(‘Hi There!‘) -- 3 // vowels(‘Why do you ask?‘) --

// --- Directions

// Write a function that returns the number of vowels

// used in a string. Vowels are the characters ‘a‘,‘e‘

// ‘i‘,‘o‘,and ‘u‘.

// --- Examples

// vowels(‘Hi There!‘) --> 3

// vowels(‘Why do you ask?‘) --> 4

// vowels(‘Why?‘) --> 0

function vowels(str) {
  const matchs = str.match(/[aeiou]/gi);
  return matchs ? matchs.length : 0;
}

module.exports = vowels;

const vowels = require(‘./index‘);

test(‘Vowels is a function‘,() => {
  expect(typeof vowels).toEqual(‘function‘);
});

test(‘returns the number of vowels used‘,() => {
  expect(vowels(‘aeiou‘)).toEqual(5);
});

test(‘returns the number of vowels used when they are capitalized‘,() => {
  expect(vowels(‘AEIOU‘)).toEqual(5);
});

test(‘returns the number of vowels used‘,() => {
  expect(vowels(‘abcdefghijklmnopqrstuvwxyz‘)).toEqual(5);
});

test(‘returns the number of vowels used‘,() => {
  expect(vowels(‘bcdfghjkl‘)).toEqual(0);
});

（编辑：李大同）

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