From e978f4365dec4751906176fe6419b88fb3ae36d5 Mon Sep 17 00:00:00 2001 From: Aayushi-Mittal Date: Fri, 8 Oct 2021 15:41:45 +0530 Subject: [PATCH 1/3] Add code and tests for checking power of 2 --- Bit-Manipulation/IsPowerOfTwo.js | 17 + Bit-Manipulation/test/IsPowerOfTwo.test.js | 21 + package-lock.json | 724 ++++++++++++++++++--- 3 files changed, 680 insertions(+), 82 deletions(-) create mode 100644 Bit-Manipulation/IsPowerOfTwo.js create mode 100644 Bit-Manipulation/test/IsPowerOfTwo.test.js diff --git a/Bit-Manipulation/IsPowerOfTwo.js b/Bit-Manipulation/IsPowerOfTwo.js new file mode 100644 index 000000000..25d15cb50 --- /dev/null +++ b/Bit-Manipulation/IsPowerOfTwo.js @@ -0,0 +1,17 @@ +/* + author: @Aayushi-Mittal + + This script will check whether the given + number is a power of two or not. + +*/ + +export const IsPowerOfTwo = (n) => { + if ((n&(n-1))==0 && n!=0) + return true; + else + return false; +} + +// console.log(IsPowerOfTwo(0)); + \ No newline at end of file diff --git a/Bit-Manipulation/test/IsPowerOfTwo.test.js b/Bit-Manipulation/test/IsPowerOfTwo.test.js new file mode 100644 index 000000000..235646eab --- /dev/null +++ b/Bit-Manipulation/test/IsPowerOfTwo.test.js @@ -0,0 +1,21 @@ +import {IsPowerOfTwo} from '../IsPowerOfTwo' + +test('Check if 0 is a power of 2 or not:', () => { + const res = IsPowerOfTwo(1, 0) + expect(res).toBe(false) +}) + +test('Check if 4 is a power of 2 or not:', () => { + const res = IsPowerOfTwo(4) + expect(res).toBe(true) +}) + +test('Check if 1024 is a power of 2 or not:', () => { + const res = IsPowerOfTwo(1024) + expect(res).toBe(true) +}) + +test('Check if 1025 is a power of 2 or not:', () => { + const res = IsPowerOfTwo(1025) + expect(res).toBe(false) +}) diff --git a/package-lock.json b/package-lock.json index baddf4b0f..8c1b2793d 100644 --- a/package-lock.json +++ b/package-lock.json @@ -2356,9 +2356,9 @@ } }, "acorn-jsx": { - 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if ((n&(n-1))==0 && n!=0) - return true; - else - return false; + if (n != 0 && (n & (n - 1)) == 0) return true + else return false } - -// console.log(IsPowerOfTwo(0)); - \ No newline at end of file diff --git a/Bit-Manipulation/test/IsPowerOfTwo.test.js b/Bit-Manipulation/test/IsPowerOfTwo.test.js index 235646eab..a971475f7 100644 --- a/Bit-Manipulation/test/IsPowerOfTwo.test.js +++ b/Bit-Manipulation/test/IsPowerOfTwo.test.js @@ -1,7 +1,12 @@ import {IsPowerOfTwo} from '../IsPowerOfTwo' test('Check if 0 is a power of 2 or not:', () => { - const res = IsPowerOfTwo(1, 0) + const res = IsPowerOfTwo(0) + expect(res).toBe(false) +}) + +test('Check if 0 is a power of 2 or not:', () => { + const res = IsPowerOfTwo(1) expect(res).toBe(false) }) From 3d8a577881575a5e361f9a605d544d7716a8a53c Mon Sep 17 00:00:00 2001 From: github-actions <${GITHUB_ACTOR}@users.noreply.github.com> Date: Fri, 8 Oct 2021 15:51:56 +0000 Subject: [PATCH 3/3] Auto-update DIRECTORY.md --- DIRECTORY.md | 1 + 1 file changed, 1 insertion(+) diff --git a/DIRECTORY.md b/DIRECTORY.md index 20c2fdce1..23a2f9a9f 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -10,6 +10,7 @@ ## Bit-Manipulation * [BinaryCountSetBits](https://github.com/TheAlgorithms/Javascript/blob/master/Bit-Manipulation/BinaryCountSetBits.js) + * [IsPowerOfTwo](https://github.com/TheAlgorithms/Javascript/blob/master/Bit-Manipulation/IsPowerOfTwo.js) * [SetBit](https://github.com/TheAlgorithms/Javascript/blob/master/Bit-Manipulation/SetBit.js) ## Cache