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algorithm: percentage of letter (#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`	`+constpercentageOfLetter=(str,letter)=>{`
	`14`	`+if(typeofstr!=='string'\|\|typeofletter!=='string'){`
	`15`	`+thrownewError('Input data must be strings')`
	`16`	`+}`
	`17`	`+letletterCount=0`
	`18`	`+// Iterate through the whole given text`
	`19`	`+for(leti=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`	`+constpercentage=Math.floor((100*letterCount)/str.length)`
	`24`	`+returnpercentage`
	`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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