Sandbox::https://github.com/Kesavan-77/JavaScript/blob/master/String/PercentageOfLetters.js

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/**

* @function percentageOfLetter

* @description Return the percentage of characters in 'str'

* that equal 'letter' rounded down to the nearest whole percent.

* More info: https://leetcode.com/problems/percentage-of-letter-in-string/

* @param {String} str

* @param {String} letter

* @returns {Number}

* @example

* const str = 'foobar', const letter = 'o'

* percentageOfLetter(str, letter) // ===> 33

const percentageOfLetter = (str, letter) => {

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

throw new Error('Input data must be strings')

}

let letterCount = 0

// Iterate through the whole given text

for (let i = 0; i < str.length; i++) {

// Count how often the letter appears in the word

letterCount += str[i].toLowerCase() === letter.toLowerCase() ? 1 : 0

}

const percentage = Math.floor((100 * letterCount) / str.length)

return percentage

}

export { percentageOfLetter }