Sandbox::https://github.com/PrasanBora/JavaScript/blob/master/String/CountVowels.js

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/**

* @function countVowels

* @description Given a string of words or phrases, count the number of vowels.

* @param {String} str - The input string

* @return {Number} - The number of vowels

* @example countVowels("ABCDE") => 2

* @example countVowels("Hello") => 2

const countVowels = (str) => {

if (typeof str !== 'string') {

throw new TypeError('Input should be a string')

}

const vowelRegex = /[aeiou]/gi

const vowelsArray = str.match(vowelRegex) || []

return vowelsArray.length

}

export { countVowels }