Halyna R.

task-1/count-above-threshold.js

@@ -1 +1,12 @@
-//Your code here
+function countAboveThreshold(numbers, threshold) {
+   let count = 0;
+  for (const num of numbers) {
+    if (num > threshold) {
+      count++;
+    }
+  }
+  return count;
+}
+console.log(countAboveThreshold([1,5,10,3],4));// returns 2
+console.log(countAboveThreshold([7,8,9],10));// returns 0
+console.log(countAboveThreshold([],5));// returns 0

task-2/calculateAverage.js

@@ -2,19 +2,15 @@ export function calculateAverage(numbers) {
   if (!Array.isArray(numbers)) {
     return null;
   }
-
   if (numbers.length === 0) {
     return null;
   }
-
   let sum = 0;
-
   for (const num of numbers) {
     if (typeof num !== "number") {
       return null;
     }
     sum += num;
   }
-
   return sum / numbers.length;
 }

task-2/calculateAverage.test.js

@@ -0,0 +1,52 @@
+import { describe, test, expect } from "vitest";
+import { calculateAverage } from "./calculateAverage.js"; 
+describe("calculateAverage", () => {
+  test("returns average for a normal array [2,4,6] -> 4", () => {
+    // Arrange
+    const numbers = [2, 4, 6];
+    // Act
+    const result = calculateAverage(numbers);
+    // Assert
+    expect(result).toBe(4);
+  });
+  test("returns the number itself for a single-item array [5] -> 5", () => {
+    // Arrange
+    const numbers = [5];
+    // Act
+    const result = calculateAverage(numbers);
+    // Assert
+    expect(result).toBe(5);
+  });
+  test("returns null for an empty array", () => {
+    // Arrange
+    const numbers = [];
+    // Act
+    const result = calculateAverage(numbers);
+    // Assert
+    expect(result).toBeNull();
+  });
+  test("returns null for non-array input (string)", () => {
+    // Arrange
+    const numbers = "123";
+    // Act
+    const result = calculateAverage(numbers);
+    // Assert
+    expect(result).toBeNull();
+  });
+  test("returns null for non-array input (null)", () => {
+    // Arrange
+    const numbers = null;
+    // Act
+    const result = calculateAverage(numbers);
+    // Assert
+    expect(result).toBeNull();
+  });
+  test('returns null if array contains a non-number value [1,2,"3"]', () => {
+    // Arrange
+    const numbers = [1, 2, "3"];
+    // Act
+    const result = calculateAverage([numbers);
+    // Assert
+    expect(result).toBeNull();
+  });
+});