lab2cmpl

lab.js

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+// ==========================
+// Part 1: Strings
+// ==========================
+
+let fullName = "Jamiir Parker";
+
+// Print length
+console.log("Length:", fullName.length);
+
+// Convert to uppercase
+console.log("Uppercase:", fullName.toUpperCase());
+
+// Check if includes last name
+console.log("Includes 'Parker':", fullName.includes("Parker"));
+
+// Slice first name
+let firstName = fullName.slice(0, fullName.indexOf(" "));
+console.log("First Name:", firstName);
+
+// Mini Challenge
+function greet(name) {
+  return "HELLO, " + name.toUpperCase() + "!";
+}
+
+console.log(greet("Jamiir"));
+
+// Check for Understanding
+// 1. .length tells how many characters are in a string
+// 2. .includes() returns true or false
+// 3. .slice() returns part of a string
+
+
+// ==========================
+// Part 2: Numbers
+// ==========================
+
+let num1 = 10;
+let num2 = 3;
+
+// Math operations
+console.log("Add:", num1 + num2);
+console.log("Subtract:", num1 - num2);
+console.log("Multiply:", num1 * num2);
+console.log("Divide:", num1 / num2);
+
+// Remainder
+console.log("Remainder:", num1 % num2);
+
+// Round decimal
+console.log("Rounded:", Math.round(4.6));
+
+// Random number 1–10
+let randomNum = Math.floor(Math.random() * 10) + 1;
+console.log("Random (1-10):", randomNum);
+
+// Mini Challenge
+function checkEvenOdd(num) {
+  if (num % 2 === 0) {
+    return "Even";
+  } else {
+    return "Odd";
+  }
+}
+
+console.log(checkEvenOdd(7));
+
+// Check for Understanding
+// 1. % gives the remainder after division
+// 2. Math.random() returns a number between 0 and 1
+// 3. Math.floor() rounds down to the nearest whole number
+
+
+// ==========================
+// Part 3: Arrays
+// ==========================
+
+let students = ["A", "B", "C", "D"];
+
+// Print all students
+for (let i = 0; i < students.length; i++) {
+  console.log("Student:", students[i]);
+}
+
+// Add a new student
+students.push("E");
+
+// Remove last student
+students.pop();
+
+// Print total number
+console.log("Total Students:", students.length);
+
+// Mini Challenge
+function sumArray(arr) {
+  let total = 0;
+  for (let i = 0; i < arr.length; i++) {
+    total += arr[i];
+  }
+  return total;
+}
+
+console.log("Sum:", sumArray([1, 2, 3, 4]));
+
+// Check for Understanding
+// 1. You access elements using index like array[0]
+// 2. .push() adds to the end of the array
+// 3. Loops are used to go through each item in an array
+
+
+// ==========================
+// Part 4: Objects
+// ==========================
+
+let car = {
+  brand: "Toyota",
+  model: "Camry",
+  year: 2020
+};
+
+// Print each property
+console.log(car.brand, car.model, car.year);
+
+// Update year
+car.year = 2024;
+
+// Add new property
+car.color = "Black";
+
+// Loop through object
+for (let key in car) {
+  console.log(key + ":", car[key]);
+}
+
+// Mini Challenge
+function describePerson(person) {
+  return person.name + " is " + person.age + " years old";
+}
+
+console.log(describePerson({ name: "Jamiir", age: 20 }));
+
+// Check for Understanding
+// 1. A key-value pair is data stored as name: value
+// 2. You access object data using dot or bracket notation
+// 3. Objects are used for structured data, arrays are for lists
+
+
+// ==========================
+// Final Challenge
+// ==========================
+
+let student = {
+  name: "Jamiir",
+  scores: [80, 90, 75, 100]
+};
+
+// Function to calculate average
+function getAverage(scores) {
+  let total = 0;
+
+  for (let i = 0; i < scores.length; i++) {
+    total += scores[i];
+  }
+
+  return total / scores.length;
+}
+
+// Function to get grade
+function getGrade(avg) {
+  if (avg >= 90) return "A";
+  else if (avg >= 80) return "B";
+  else if (avg >= 70) return "C";
+  else if (avg >= 60) return "D";
+  else return "F";
+}
+
+let average = getAverage(student.scores);
+let grade = getGrade(average);
+
+console.log("Name:", student.name);
+console.log("Average:", average);
+console.log("Grade:", grade);
+
+
+// ==========================
+// Reflection
+// ==========================
+
+// 1. Strings felt the easiest because the methods are simple to use.
+// 2. Objects were the most confusing because of looping and key-value pairs.
+// 3. Arrays store lists of data, objects store labeled data (key-value).
+// 4. Arrays are used for lists like scores, objects are used for structured data like a user profile.