dev grp java 2

maxxblue/js-data-types-lab/lab.js

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+// Part 1: String Methods
+
+let fullName = "Amani Drummond";
+
+
+console.log(fullName.length);
+
+
+console.log(fullName.toUpperCase());
+
+
+console.log(fullName.includes("Drummond")); 
+
+
+console.log(fullName.slice(0, 4)); 
+
+// Mini Challenge:   
+function greet(name) {
+    return "Hello, " + name.toUpperCase() + "!";
+}
+
+console.log(greet("Amani")); 
+
+// .length → Returns the number of elements in something.
+
+// .includes() → Checks if something contains a value. Returns true or false.
+
+// .slice() → Returns a portion (piece) of a string or array.
+
+
+
+
+
+//Part 2: Number Methods
+
+//  Create Variables
+let num1 = 10
+let num2 = 3;
+
+// Math operations
+let sum = num1 + num2;
+let difference = num1 - num2;
+let product = num1 * num2;
+let quotient = num1 / num2;
+let remainder = num1 % num2;
+
+// Round a decimal number
+let roundedNumber = Math.round(4.6);
+
+// Random number between 1 and 10
+let randomNumber = Math.floor(Math.random() * 10) + 1;
+
+// Print results
+console.log("Addition:", sum);
+console.log("Subtraction:", difference);
+console.log("Multiplication:", product);
+console.log("Division:", quotient);
+console.log("Remainder:", remainder);
+console.log("Rounded number:", roundedNumber);
+console.log("Random number (1-10):", randomNumber);
+
+// Mini Challenge
+function checkEvenOrOdd(number) {
+  if (number % 2 === 0) {
+    return "Even";
+  } else {
+    return "Odd";
+  }
+}
+
+// Test the function
+console.log(checkEvenOrOdd(4)); // Even
+console.log(checkEvenOrOdd(7)); // Odd
+
+
+
+// Check for Understanding
+
+//1. What does `%` do?
+//% gives the remainder of a division operation. For example, `10 % 3` would return `1` because when you divide 10 by 3, the quotient is 3 with a remainder of 1.
+
+//2. What does `Math.random()` return?
+//Math.random()` returns a random decimal number between 0 (inclusive) and 1 (exclusive).
+
+//3. When would you use `Math.floor()`?
+//`Math.floor()` is used to round a decimal number down to the nearest integer.
+
+
+
+//Part 3: ARRAYS
+
+let students = ["Ben", "Adam", "Gary", "Lindsey"];
+
+for (let i = 0; i < students.length; i++) {
+  console.log(students[i]);
+}
+//====== OR =====
+//for (let student of students) {
+//  console.log(student);
+//}
+
+
+students.push("Jeff");
+console.log("After adding:", students);
+
+students.pop();
+console.log("After removing:", students);
+
+console.log("Total students:", students.length);
+
+//Mini Challenge
+function sumArray(numbers) {
+  let total = 0;
+
+  for (let i = 0; i < numbers.length; i++) {
+    total += numbers[i];
+  }
+
+  return total;
+}
+
+let nums = [1, 2, 3, 4, 5];
+console.log("Sum:", sumArray(nums));
+
+//Do you understand???
+
+//Question 1...How do you access an array element?
+//Answer 1...using the index..ex: students[0]
+
+//Question 2...What does .push() do?
+//Answer 2...it adds a new item to the end of your array
+
+//Question 3...Why do we use loops with arrays?
+//Answer 3...an array can hold multiple values and loops allows you to go through each item
+
+
+
+
+//Part 4: Objects
+
+let car = {
+    brand: "Toyota",
+    model: "Camry",
+    year: 2020,
+}
+console.log(car.brand); // Output: Toyota
+console.log(car.model); // Output: Camry
+console.log(car.year); // Output: 2020
+
+car.year = 2024;
+console.log("Updated year: ", car.year);
+
+car.color = "black";
+console.log("Color added: ", car.color);
+
+for (let key in car) {
+    console.log(key, car[key]);
+}
+
+function describePerson(person) {
+    return person.name + " is " + person.age + " years old.";
+}
+
+let bobby = {
+    name: "Bobby",
+    age: 24,
+};
+console.log(describePerson(bobby));
+
+/*
+1. A key-value pair is a label (key) paired with its data (value). like name: "Bobby"
+2. You access object data using dot notation (person.name) or bracket notation (person["name"])
+3. Use an object when data has named properties, use an array when data is a simple list
+*/
+
+
+
+//Final Challenge: Student Grade Calculator
+const student = {
+  name: "Amani",
+  scores: [80, 90, 75, 100]
+};
+
+
+function calculateAverage(scores) {
+  let total = 0;
+
+
+  for (let i = 0; i < scores.length; i++) {
+    total += scores[i];
+  }
+
+  return total / scores.length;
+}
+
+
+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";
+  }
+}
+
+
+const average = calculateAverage(student.scores);
+const grade = getGrade(average);
+
+
+console.log("Name:", student.name);
+console.log("Average:", Math.round(average));
+console.log("Grade:", grade);
+
+//Questions:
+//At the bottom of your file, answer:
+
+//1. Which data type felt easiest? 
+//i think strings were the easiest because they are just text and have a lot of built-in methods that are easy to understand and use.
+
+//2. Which one was most confusing?
+//i think objects were the most confusing because they can hold multiple key-value pairs and it can be tricky to understand how to access and manipulate the data within them.
+
+//3. How do arrays and objects differ?
+//Arrays are ordered lists of values accessed by index, while objects are collections of key-value pairs accessed by keys. Arrays are typically used for lists of items, while objects are used to represent more complex data structures with named properties.
+
+//4. When would you use each in real applications?
+//You would use arrays when you need to store a list of items, such as a list of students or products. You would use objects when you need to represent more complex data with multiple properties, such as a user profile with name, age, and email.