[Hacker Rank] Interview Preparation Kit: Miscellaneous: Flipping bits…

docs/hackerrank/interview_preparation_kit/miscellaneous/flipping-bits-alt-solution-notes.md

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+# [Miscellaneous: Flipping bits](https://www.hackerrank.com/challenges/flipping-bits)
+
+- Difficulty:  `#easy`
+- Category: `#ProblemSolvingBasic` `#BitManipulation`
+
+## Using bitwise operations
+
+The bitwise NOT operator (~) flips all bits of the number.
+
+The & 0xFFFFFFFF ensures that we only keep the last 32 bits,
+effectively simulating a 32-bit unsigned integer.
+
+This is a more efficient and concise way to achieve the same result
+as the original code, without needing to convert to binary strings.

src/hackerrank/interview_preparation_kit/miscellaneous/flipping-bits-alt.js

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+/**
+ * @link Problem definition [[docs/hackerrank/interview_preparation_kit/miscellaneous/flipping-bits.md]]
+ * @see Solution notes [[docs/hackerrank/interview_preparation_kit/miscellaneous/flipping-bits-alt-solution-notes.md]]
+ */
+
+function flippingBitsAlt(n) {
+  // eslint-disable-next-line no-bitwise
+  return ~n >>> 0;
+}
+
+export default { flippingBitsAlt };
+export { flippingBitsAlt };

src/hackerrank/interview_preparation_kit/miscellaneous/flipping-bits-alt.test.js

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+import { describe, expect, it } from '@jest/globals';
+import { logger as console } from '../../../logger.js';
+
+import { flippingBitsAlt } from './flipping-bits-alt.js';
+
+import TEST_CASES from './flipping-bits.testcases.json';
+
+describe('flipping bits', () => {
+  it('flipping bits test cases', () => {
+    expect.assertions(10);
+
+    let totalTestsCount = 0;
+
+    TEST_CASES.forEach((testSet) => {
+      testSet.tests.forEach((test) => {
+        const answer = flippingBitsAlt(test.input);
+
+        console.debug(
+          `flippingBitsAlt(${test.input}) solution found: ${answer}`
+        );
+
+        expect(answer).toStrictEqual(test.expected);
+
+        totalTestsCount += 1;
+      });
+    });
+
+    expect(TEST_CASES).toHaveLength(3);
+    expect(totalTestsCount).toBe(8);
+  });
+});