Intro2

JavaScriptIntro2/lab.js

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+// JavaScript Data Types Lab: Strings, Numbers, Arrays & Objects
+// Student Name: Kenneth Edelin
+
+// ======================================================
+// Part 1: Strings
+// ======================================================
+
+let fullName = "Kenneth Edelin";
+
+// Print the length of the string
+console.log("Full name length:", fullName.length);
+
+// Convert it to uppercase
+console.log("Uppercase full name:", fullName.toUpperCase());
+
+// Check if it includes your last name
+console.log("Includes 'Edelin':", fullName.includes("Edelin"));
+
+// Slice out your first name only
+console.log("First name only:", fullName.slice(0, 7));
+
+// Mini Challenge
+// Create a function that accepts a name
+// Returns: "Hello, NAME!" (all caps)
+
+function greetName(name) {
+  return "Hello, " + name.toUpperCase() + "!";
+}
+
+console.log(greetName("Kenneth"));
+console.log(greetName("Kenneth Edelin"));
+
+// Check for Understanding
+// What does .length do?
+// .length returns the total number of characters in a string.
+
+// What does .includes() return?
+// .includes() returns true or false depending on whether the text is found.
+
+// What does .slice() do?
+// .slice() returns part of a string between selected start and end positions.
+
+
+// ======================================================
+// Part 2: Numbers
+// ======================================================
+
+let num1 = 10;
+let num2 = 3;
+
+// Add, subtract, multiply, divide
+console.log("Addition:", num1 + num2);
+console.log("Subtraction:", num1 - num2);
+console.log("Multiplication:", num1 * num2);
+console.log("Division:", num1 / num2);
+
+// Find remainder
+console.log("Remainder:", num1 % num2);
+
+// Round a decimal number
+let decimalNumber = 4.6;
+console.log("Rounded decimal:", Math.round(decimalNumber));
+
+// Generate a random number between 1–10
+let randomNumber = Math.floor(Math.random() * 10) + 1;
+console.log("Random number (1-10):", randomNumber);
+
+// Mini Challenge
+// Create a function that accepts a number
+// Returns "Even" if even and "Odd" if odd
+
+function checkEvenOrOdd(number) {
+  if (number % 2 === 0) {
+    return "Even";
+  } else {
+    return "Odd";
+  }
+}
+
+console.log("8 is:", checkEvenOrOdd(8));
+console.log("13 is:", checkEvenOrOdd(13));
+
+// Check for Understanding
+// What does % do?
+// % gives the remainder after division.
+
+// What does Math.random() return?
+// Math.random() returns a random decimal number between 0 and 1.
+
+// When would you use Math.floor()?
+// You use Math.floor() when you want to round down to the nearest whole number.
+
+
+// ======================================================
+// Part 3: Arrays
+// ======================================================
+
+let students = ["A", "B", "C", "D"];
+
+// Print all students
+console.log("Original students:");
+for (let i = 0; i < students.length; i++) {
+  console.log(students[i]);
+}
+
+// Add a new student
+students.push("Kenneth");
+console.log("After push:", students);
+
+// Remove the last student
+students.pop();
+console.log("After pop:", students);
+
+// Print total number of students
+console.log("Total number of students:", students.length);
+
+// Mini Challenge
+// Create a function that accepts an array of numbers
+// Returns the sum of all numbers
+
+function sumArray(numbers) {
+  let total = 0;
+
+  for (let i = 0; i < numbers.length; i++) {
+    total += numbers[i];
+  }
+
+  return total;
+}
+
+console.log("Sum of [10, 20, 30, 40]:", sumArray([10, 20, 30, 40]));
+
+// Check for Understanding
+// How do you access an array element?
+// You access an array element by using its index, like array[0].
+
+// What does .push() do?
+// .push() adds a new item to the end of an array.
+
+// Why do we use loops with arrays?
+// We use loops with arrays to go through each item one by one.
+
+
+// ======================================================
+// Part 4: Objects
+// ======================================================
+
+let car = {
+  brand: "Toyota",
+  model: "Camry",
+  year: 2020
+};
+
+// Print each property
+console.log("Car brand:", car.brand);
+console.log("Car model:", car.model);
+console.log("Car year:", car.year);
+
+// Update the year
+car.year = 2024;
+console.log("Updated year:", car.year);
+
+// Add a new property (color)
+car.color = "Black";
+console.log("Car color:", car.color);
+
+// Loop through the object
+console.log("Looping through car object:");
+for (let key in car) {
+  console.log(key + ":", car[key]);
+}
+
+// Mini Challenge
+// Create a function that accepts a person object
+// Returns a sentence like: "Name is AGE years old"
+
+function describePerson(person) {
+  return person.name + " is " + person.age + " years old.";
+}
+
+let person = {
+  name: "Kenneth Edelin",
+  age: 28,
+  isStudent: true
+};
+
+console.log(describePerson(person));
+
+// Check for Understanding
+// What is a key-value pair?
+// A key-value pair is a label and the data connected to it, like name: "Kenneth".
+
+// How do you access object data?
+// You can access object data with dot notation or bracket notation.
+
+// When would you use an object instead of an array?
+// You use an object when you want to group related data with named properties.
+
+
+// ======================================================
+// Final Challenge: Combine Everything
+// Scenario: Student Profile System
+// ======================================================
+
+// Step 1: Object
+let studentProfile = {
+  name: "Kenneth Edelin",
+  scores: [80, 90, 75, 100]
+};
+
+// Function to calculate average
+function calculateAverage(scores) {
+  let total = 0;
+
+  for (let i = 0; i < scores.length; i++) {
+    total += scores[i];
+  }
+
+  return total / scores.length;
+}
+
+// Function to determine grade
+function determineGrade(average) {
+  if (average >= 90) {
+    return "A";
+  } else if (average >= 80) {
+    return "B";
+  } else if (average >= 70) {
+    return "C";
+  } else if (average >= 60) {
+    return "D";
+  } else {
+    return "F";
+  }
+}
+
+// Use the functions
+let averageScore = calculateAverage(studentProfile.scores);
+let letterGrade = determineGrade(averageScore);
+
+// Print final results
+console.log("Name:", studentProfile.name);
+console.log("Average:", averageScore);
+console.log("Grade:", letterGrade);
+
+
+// ======================================================
+// Extra Console Testing
+// ======================================================
+
+console.log("----- Extra Testing -----");
+console.log("Greeting test:", greetName("Kenneth Edelin"));
+console.log("Even/Odd test 22:", checkEvenOrOdd(22));
+console.log("Even/Odd test 19:", checkEvenOrOdd(19));
+console.log("Sum test:", sumArray([1, 2, 3, 4, 5]));
+console.log("Person test:", describePerson({ name: "Kenneth", age: 30 }));
+
+
+// ======================================================
+// Reflection (REQUIRED)
+// ======================================================
+
+// Which data type felt easiest?
+// Arrays felt easiest because it is simple to store multiple values in one place and loop through them.
+
+// Which one was most confusing?
+// Objects can be the most confusing at first because they use keys and values instead of positions like arrays.
+
+// How do arrays and objects differ?
+// Arrays store lists of values in order, while objects store related data using named keys.
+
+// When would you use each in real applications?
+// You would use arrays for lists like scores, products, or messages.
+// You would use objects for structured data like a user profile, car details, or a student record.