copy fix folder from CYF main

Author: AhmadHmedann

Sprint-1/fix/median.js

@@ -0,0 +1,14 @@
+// Fix this implementation
+// Start by running the tests for this function
+// If you're in the Sprint-1 directory, you can run `npm test -- fix` to run the tests in the fix directory
+
+// Hint: Please consider scenarios when 'list' doesn't have numbers (the function is expected to return null)
+// or 'list' has mixed values (the function is expected to sort only numbers).
+
+function calculateMedian(list) {
+  const middleIndex = Math.floor(list.length / 2);
+  const median = list.splice(middleIndex, 1)[0];
+  return median;
+}
+
+module.exports = calculateMedian;

Sprint-1/fix/median.test.js

@@ -0,0 +1,62 @@
+// median.test.js
+
+// Someone has implemented calculateMedian but it isn't
+// passing all the tests...
+// Fix the implementation of calculateMedian so it passes all tests
+
+const calculateMedian = require("./median.js");
+
+describe("calculateMedian", () => {
+  [
+    { input: [1, 2, 3], expected: 2 },
+    { input: [1, 2, 3, 4, 5], expected: 3 },
+    { input: [1, 2, 3, 4], expected: 2.5 },
+    { input: [1, 2, 3, 4, 5, 6], expected: 3.5 },
+  ].forEach(({ input, expected }) =>
+    it(`returns the median for [${input}]`, () =>
+      expect(calculateMedian(input)).toEqual(expected))
+  );
+
+  [
+    { input: [3, 1, 2], expected: 2 },
+    { input: [5, 1, 3, 4, 2], expected: 3 },
+    { input: [4, 2, 1, 3], expected: 2.5 },
+    { input: [6, 1, 5, 3, 2, 4], expected: 3.5 },
+    { input: [110, 20, 0], expected: 20 },
+    { input: [6, -2, 2, 12, 14], expected: 6 },
+  ].forEach(({ input, expected }) =>
+    it(`returns the correct median for unsorted array [${input}]`, () =>
+      expect(calculateMedian(input)).toEqual(expected))
+  );
+
+  it("doesn't modify the input array [3, 1, 2]", () => {
+    const list = [3, 1, 2];
+    calculateMedian(list);
+    expect(list).toEqual([3, 1, 2]);
+  });
+
+  [
+    "not an array",
+    123,
+    null,
+    undefined,
+    {},
+    [],
+    ["apple", null, undefined],
+  ].forEach((val) =>
+    it(`returns null for non-numeric array (${val})`, () =>
+      expect(calculateMedian(val)).toBe(null))
+  );
+
+  [
+    { input: [1, 2, "3", null, undefined, 4], expected: 2 },
+    { input: ["apple", 1, 2, 3, "banana", 4], expected: 2.5 },
+    { input: [1, "2", 3, "4", 5], expected: 3 },
+    { input: [1, "apple", 2, null, 3, undefined, 4], expected: 2.5 },
+    { input: [3, "apple", 1, null, 2, undefined, 4], expected: 2.5 },
+    { input: ["banana", 5, 3, "apple", 1, 4, 2], expected: 3 },
+  ].forEach(({ input, expected }) =>
+    it(`filters out non-numeric values and calculates the median for [${input}]`, () =>
+      expect(calculateMedian(input)).toEqual(expected))
+  );
+});