Refactor mean calculation and tests for clarity and functionality

Author: Baba05206

prep/mean.js

@@ -23,7 +23,7 @@ console.log(items[1]); // 5.03
 console.log(items[2]); // 7.99
 console.log(items[3]); // 8.01
 // Accessing elements using index numbers
-*/
+
 const items = [4.6, 5.03, 7.99, 8.01];
 function calculateMean(list) {
   // Calculate the sum of all elements in the array
@@ -35,3 +35,25 @@ function calculateMean(list) {
   const mean = sum / list.length;
   return mean;
 }
+  */
+//const list = [4.6, 5.03, 7.99, 8.01];
+function calculateMean(list) {
+  //1. sum the elements of the array
+  let sum = 0;
+  for (let i = 0; i < list.length; i++) {
+    const arrayInValue = Number(list);
+    if (typeof list[i] === "number" && !isNaN(list[i])) {
+      sum += list[i];
+    }
+  }
+  //2. determine the length of the array
+  let count = list.length;
+  //3. divide #1 by #2
+  const mean = sum / count;
+  //4. return #3
+  return mean;
+}
+console.log(calculateMean([4.6, 5.03, 7.99, 8.01]));
+console.log(calculateMean([3, "50", 7]));
+
+//module.exports = calculateMean;

prep/mean.test.js

@@ -2,11 +2,25 @@
 test("does something as described below", () => {   
     // test implementation goes here    
 });
+
+
 */
+//mean.test.js
+const mean = require("./mean"); // Import the mean function from mean.js
+test("calculates the mean of a list of numbers", () => {
+  expect(mean([3, 50, 7])).toBe(20); // 20 is (3 + 50 + 7) / 3
+  expect(mean([4.6, 5.03, 7.99, 8.01])).toBeCloseTo(6.4075); // 6.4075 is (4.6 + 5.03 + 7.99 + 8.01) / 4
+  expect(mean([10, 20, 30, 40, 50])).toBe(30); // 30 is (10 + 20 + 30 + 40 + 50) / 5
+  expect(mean([1, 2, 3, 4, 5, 6])).toBe(3.5); // 3.5 is (1 + 2 + 3 + 4 + 5 + 6) / 6
+});
+/*
+The expect statement is used to create an assertion that checks if the output of the mean function matches the expected value.
 test("calculates the mean of a list of numbers", () => {
   const list = [3, 50, 7];
   const currentOutput = calculateMean(list);
   const targetOutput = 20;
 
   expect(currentOutput).toEqual(targetOutput); // 20 is (3 + 50 + 7) / 3
 });
+
+*/