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algorithm: percentage of letter (TheAlgorithms#1261)

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	`1`	`+/**`
	`2`	`+ * @function percentageOfLetter`
	`3`	`+ * @description Return the percentage of characters in 'str'`
	`4`	`+ * that equal 'letter' rounded down to the nearest whole percent.`
	`5`	`+ * More info: https://leetcode.com/problems/percentage-of-letter-in-string/`
	`6`	`+ * @param {String} str`
	`7`	`+ * @param {String} letter`
	`8`	`+ * @returns {Number}`
	`9`	`+ * @example`
	`10`	`+ * const str = 'foobar', const letter = 'o'`
	`11`	`+ * percentageOfLetter(str, letter) // ===> 33`
	`12`	`+ */`
	`13`	`+const percentageOfLetter = (str, letter) => {`
	`14`	`+ if (typeof str !== 'string' \|\| typeof letter !== 'string') {`
	`15`	`+ throw new Error('Input data must be strings')`
	`16`	`+ }`
	`17`	`+ let letterCount = 0`
	`18`	`+ // Iterate through the whole given text`
	`19`	`+ for (let i = 0; i < str.length; i++) {`
	`20`	`+ // Count how often the letter appears in the word`
	`21`	`+ letterCount += str[i].toLowerCase() === letter.toLowerCase() ? 1 : 0`
	`22`	`+ }`
	`23`	`+ const percentage = Math.floor((100 * letterCount) / str.length)`
	`24`	`+ return percentage`
	`25`	`+}`
	`26`	`+`
	`27`	`+export { percentageOfLetter }`

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	`1`	`+import { percentageOfLetter } from '../PercentageOfLetters'`
	`2`	`+`
	`3`	`+describe('Percentage of Letters in a String', () => {`
	`4`	`+ test('Calculate percent for lower case', () => {`
	`5`	`+ expect(percentageOfLetter('foobar', 'o')).toEqual(33)`
	`6`	`+ expect(percentageOfLetter('aaabcd', 'a')).toEqual(50)`
	`7`	`+ })`
	`8`	`+ test('Calculate percent for upper case', () => {`
	`9`	`+ expect(percentageOfLetter('foobar', 'o')).toEqual(33)`
	`10`	`+ expect(percentageOfLetter('aAabcd', 'a')).toEqual(50)`
	`11`	`+ })`
	`12`	`+ test('Throwing an exception', () => {`
	`13`	`+ expect(() => percentageOfLetter(100, 'string')).toThrow()`
	`14`	`+ expect(() => percentageOfLetter('string', true)).toThrow()`
	`15`	`+ })`
	`16`	`+})`

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