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Merge pull request #6 from somekindofwallflower/feature/reverse_integer

Implement the solution for reverse integer problem

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	`1`	`+// --- Directions`
	`2`	`+// Given an integer, return an integer that is the reverse`
	`3`	`+// ordering of numbers.`
	`4`	`+// --- Examples`
	`5`	`+// reverseInt(15) === 51`
	`6`	`+// reverseInt(981) === 189`
	`7`	`+// reverseInt(500) === 5`
	`8`	`+// reverseInt(-15) === -51`
	`9`	`+// reverseInt(-90) === -9`
	`10`	`+`
	`11`	`+// Tips to solve the problem`
	`12`	`+// - Convert number to string by using toString function`
	`13`	`+// - Check if it is a sign number or not by using Math.sign() function.`
	`14`	`+// - Convert string to number by using parseInt method`
	`15`	`+`
	`16`	`+function reverseInt(n) {`
	`17`	`+ const reversed = n`
	`18`	`+ .toString()`
	`19`	`+ .split('')`
	`20`	`+ .reverse()`
	`21`	`+ .join('');`
	`22`	`+ return parseInt(reversed) * Math.sign(n);`
	`23`	`+}`
	`24`	`+`
	`25`	`+`
	`26`	`+module.exports = reverseInt;`

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	`1`	`+const reverseInt = require('./index');`
	`2`	`+`
	`3`	`+test('ReverseInt function exists', () => {`
	`4`	`+ expect(reverseInt).toBeDefined();`
	`5`	`+});`
	`6`	`+`
	`7`	`+test('ReverseInt handles 0 as an input', () => {`
	`8`	`+ expect(reverseInt(0)).toEqual(0);`
	`9`	`+});`
	`10`	`+`
	`11`	`+test('ReverseInt flips a positive number', () => {`
	`12`	`+ expect(reverseInt(5)).toEqual(5);`
	`13`	`+ expect(reverseInt(15)).toEqual(51);`
	`14`	`+ expect(reverseInt(90)).toEqual(9);`
	`15`	`+ expect(reverseInt(2359)).toEqual(9532);`
	`16`	`+});`
	`17`	`+`
	`18`	`+test('ReverseInt flips a negative number', () => {`
	`19`	`+ expect(reverseInt(-5)).toEqual(-5);`
	`20`	`+ expect(reverseInt(-15)).toEqual(-51);`
	`21`	`+ expect(reverseInt(-90)).toEqual(-9);`
	`22`	`+ expect(reverseInt(-2359)).toEqual(-9532);`
	`23`	`+});`

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