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algorithm: Hexagonal number (#1265)

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	`1`	`+/*`
	`2`	`+ * Author: Akshay Dubey (https://github.com/itsAkshayDubey)`
	`3`	`+ * Hexagonal Number: https://en.wikipedia.org/wiki/Hexagonal_number`
	`4`	`+ * The nth hexagonal number hn is the number of distinct dots in a pattern of dots`
	`5`	`+ * consisting of the outlines of regular hexagons with sides up to n dots, when the`
	`6`	`+ * hexagons are overlaid so that they share one vertex.`
	`7`	`+ */`
	`8`	`+`
	`9`	`+/**`
	`10`	`+ *@function hexagonalNumber`
	`11`	`+ *@description -> returns nth hexagonal number`
	`12`	`+ *@param {Integer} number`
	`13`	`+ *@returns {Integer} nth hexagonal number`
	`14`	`+ */`
	`15`	`+`
	`16`	`+exportconsthexagonalNumber=(number)=>{`
	`17`	`+if(number<=0){`
	`18`	`+thrownewError('Number must be greater than zero.')`
	`19`	`+}`
	`20`	`+returnnumber(2number-1)`
	`21`	`+}`

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	`1`	`+import{hexagonalNumber}from'../HexagonalNumber'`
	`2`	`+`
	`3`	`+constexpectedValuesArray=[1,6,15,28,45,66,91,120,153,190,231,276,325,378,435,496,561,630,703,780,861,946]`
	`4`	`+`
	`5`	`+describe('Testing hexagonalNumber',()=>{`
	`6`	`+for(leti=1;i<=22;i++){`
	`7`	`+it('Testing for number = '+i+', should return '+expectedValuesArray[i],()=>{`
	`8`	`+expect(hexagonalNumber(i)).toBe(expectedValuesArray[i-1])`
	`9`	`+})`
	`10`	`+}`
	`11`	`+`
	`12`	`+it('should throw error when supplied negative numbers',()=>{`
	`13`	`+expect(()=>{hexagonalNumber(-1)}).toThrow(Error)`
	`14`	`+})`
	`15`	`+`
	`16`	`+it('should throw error when supplied zero',()=>{`
	`17`	`+expect(()=>{hexagonalNumber(0)}).toThrow(Error)`
	`18`	`+})`
	`19`	`+})`

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