London | ITP-May-25 | Houssam Lahlah | Sprint 3 | Reading List

Sprint-2/debug/address.js

@@ -12,4 +12,4 @@ const address = {
   postcode: "XYZ 123",
 };
 
-console.log(`My house number is ${address[0]}`);
+console.log(`My house number is ${address[0]}`);

Sprint-2/debug/recipe.js

@@ -12,4 +12,4 @@ const recipe = {
 
 console.log(`${recipe.title} serves ${recipe.serves}
   ingredients:
-${recipe}`);
+${recipe}`);

Sprint-3/reading-list/script.js

@@ -21,3 +21,27 @@ const books = [
   },
 ];
 
+function readingList(books) {
+  const list = document.getElementById("reading-list");
+
+  books.forEach((book) => {
+    const li = document.createElement("li");
+    li.style.backgroundColor = book.alreadyRead ? "green" : "red";
+
+    const title = document.createElement("p");
+    title.textContent = book.title;
+
+    const author = document.createElement("p");
+    author.textContent = book.author;
+
+    const image = document.createElement("img");
+    image.src = book.bookCoverImage;
+
+    li.appendChild(title);
+    li.appendChild(author);
+    li.appendChild(image);
+    list.appendChild(li);
+  });
+}
+
+readingList(books);

prep/mean.js

@@ -0,0 +1,9 @@
+function calculateMean(list) {
+  const sum = list.reduce((acc, num) => acc + num, 0);
+  return sum / list.length;
+}
+
+module.exports = calculateMean;
+
+
+// module.exports = { calculateMean };

prep/mean.test.js

@@ -0,0 +1,9 @@
+const calculateMean = require("./mean");
+
+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
+});

prep/median.js

@@ -0,0 +1,29 @@
+/*
+// prep/median.js
+function calculateMedian(list) {
+  const middleIndex = Math.floor(list.length / 2);
+  const median = list.splice(middleIndex, 1)[0];
+
+  return median;
+}
+module.exports = calculateMedian;
+*/
+
+// We clone the array with [...numbers] 
+// before sorting to avoid mutating the original input.
+
+
+function calculateMedian(numbers) {
+  const sorted = [...numbers].sort((a, b) => a - b);
+  const mid = Math.floor(sorted.length / 2);
+
+  if (sorted.length % 2 === 0) {
+    return (sorted[mid - 1] + sorted[mid]) / 2;
+  } else {
+    return sorted[mid];
+  }
+}
+
+module.exports = calculateMedian;
+
+

prep/median.test.js

@@ -0,0 +1,46 @@
+// const { calculateMedian } = require("./median");
+const calculateMedian = require("./median");
+
+
+const calculateMean = require("./mean");
+// const { calculateMean } = require("./mean");
+
+test("calculates the median of a list of odd length", () => {
+  const list = [10, 20, 30, 50, 60];
+  const currentOutput = calculateMedian(list);
+  const targetOutput = 30;
+
+  expect(currentOutput).toEqual(targetOutput);
+})
+
+test("calculates the median of an odd-length array", () => {
+  const list = [3, 50, 7];
+  const currentOutput = calculateMedian(list); // sorted = [3, 7, 50], median = 7
+  const expectedOutput = 7;
+
+  expect(currentOutput).toEqual(expectedOutput);
+});
+
+test("calculates the median of a list of odd length", () => {
+  const list = [10, 20, 30, 40];
+  const currentOutput = calculateMedian(list);
+  const targetOutput = 25;
+
+  expect(currentOutput).toEqual(targetOutput);
+}) 
+
+// Both functions access the same array 
+// because JavaScript passes objects and 
+// arrays by reference — they all point to the same memory location.
+
+const salaries = [10, 20, 30, 40, 60, 80, 80];
+const median = calculateMedian(salaries);
+const mean = calculateMean(salaries);
+console.log(salaries, "<--- salaries input before we call calculateMean");
+console.log(`The median salary is ${median}`);
+console.log(`The mean salary is ${mean}`);
+
+
+
+
+