[Hacker Rank]: Minimum Absolute Difference in an Array solved ✓

Author: sir-gon

src/hackerrank/implementation/minimumAbsoluteDifference.test.ts

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+import logger from '../../logger';
+
+import { minimumAbsoluteDifference } from './minimumAbsoluteDifference';
+
+describe('problem 00XX', () => {
+  it('Minimum Absolute Difference in an Array border case', () => {
+    expect.assertions(1);
+
+    expect(() => {
+      minimumAbsoluteDifference([]);
+    }).toThrow('Empty input');
+  });
+
+  it('Minimum Absolute Difference in an Array Test case 0', () => {
+    expect.assertions(1);
+
+    const input = [3, -7, 0];
+    const solutionFound = 3;
+
+    const calculated = minimumAbsoluteDifference(input);
+
+    logger.info(
+      `Minimum Absolute Difference in an Array Test case 0: ${calculated}`
+    );
+
+    expect(calculated).toStrictEqual(solutionFound);
+  });
+
+  it('Minimum Absolute Difference in an Array Test case 1', () => {
+    expect.assertions(1);
+
+    const input = [-59, -36, -13, 1, -53, -92, -2, -96, -54, 75];
+    const solutionFound = 1;
+
+    const calculated = minimumAbsoluteDifference(input);
+
+    logger.info(
+      `Minimum Absolute Difference in an Array Test case 1: ${calculated}`
+    );
+
+    expect(calculated).toStrictEqual(solutionFound);
+  });
+});

src/hackerrank/implementation/minimumAbsoluteDifference.ts

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+/**
+ * Minimum Absolute Difference in an Array
+ *
+ * https://www.hackerrank.com/challenges/minimum-absolute-difference-in-an-array
+ *
+ * <DESCRIPTION>
+ *
+ */
+
+import { logger as console } from '../../logger';
+
+export function minimumAbsoluteDifference(arr: number[]): number {
+  if (arr.length == 0) {
+    throw new Error('Empty input');
+  }
+
+  const sortedNums = arr.splice(0).sort();
+  console.log(`sortedNums: ${sortedNums}`);
+
+  let result: number = Math.abs(sortedNums[0] - sortedNums[1]);
+
+  for (let i = 0; i < sortedNums.length - 1; i++) {
+    const a = sortedNums[i];
+    const b = sortedNums[i + 1];
+
+    const diff = Math.abs(a - b);
+
+    console.debug(
+      `(i: ${i}, i+1: ${i + 1}) => |a - b| = |${a} - ${b}| = ${diff}`
+    );
+
+    result = Math.min(result, diff);
+  }
+
+  return result;
+}
+
+export default { minimumAbsoluteDifference };