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Lines changed: 18 additions & 7 deletions

Original file line number	Diff line number	Diff line change
`@@ -4,14 +4,25 @@`
`4`	`4`	`This script will check whether the given`
`5`	`5`	`number is a power of two or not.`
`6`	`6`
	`7`	`+ A number will be a power of two if only one bit is set and rest are unset.`
	`8`	`+ This is true for all the cases except 01 because (2^0 = 1) which is not a power of 2.`
	`9`	`+ For eg: 10 (2^1 = 2), 100 (2^2 = 4), 10000 (2^4 = 16)`
	`10`	`+`
	`11`	`+ Reference Link: https://www.hackerearth.com/practice/notes/round-a-number-to-the-next-power-of-2/`
	`12`	`+`
	`13`	`+ If we will subtract 1 from a number that is a power of 2 we will get it's 1's complement.`
	`14`	`+ And we know that 1's complement is just opp. of that number.`
	`15`	`+ So, (n & (n-1)) will be 0.`
	`16`	`+`
	`17`	`+ For eg: (1000 & (1000-1))`
	`18`	`+ 1 0 0 0 // Original Number (8)`
	`19`	`+ 0 1 1 1 // After Subtracting 1 (8-1 = 7)`
	`20`	`+ _______`
	`21`	`+ 0 0 0 0 // will become 0`
	`22`	`+`
`7`	`23`	`*/`
`8`	`24`
`9`	`25`	`export const IsPowerOfTwo = (n) => {`
`10`		`- if ((n&(n-1))==0 && n!=0)`
`11`		`- return true;`
`12`		`- else`
`13`		`- return false;`
	`26`	`+ if (n != 0 && (n & (n - 1)) == 0) return true`
	`27`	`+ else return false`
`14`	`28`	`}`
`15`		`-`
`16`		`-// console.log(IsPowerOfTwo(0));`
`17`		`-`

Lines changed: 6 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1,7 +1,12 @@`
`1`	`1`	`import {IsPowerOfTwo} from '../IsPowerOfTwo'`
`2`	`2`
`3`	`3`	`test('Check if 0 is a power of 2 or not:', () => {`
`4`		`- const res = IsPowerOfTwo(1, 0)`
	`4`	`+ const res = IsPowerOfTwo(0)`
	`5`	`+ expect(res).toBe(false)`
	`6`	`+})`
	`7`	`+`
	`8`	`+test('Check if 0 is a power of 2 or not:', () => {`
	`9`	`+ const res = IsPowerOfTwo(1)`
`5`	`10`	`expect(res).toBe(false)`
`6`	`11`	`})`
`7`	`12`

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