Derwin Bell Finished Javascript-Intro-2

src/javascipt-datatypes/lab.js

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+// JavaScript Data Types Lab
+// Name: Derwin Bell
+
+// Strings
+
+let FullName = "Derwin Bell";
+console.log("Length of name: ", FullName.length);
+console.log("To upper case: ", FullName.toUpperCase());
+console.log("To lower case: ", FullName.toLowerCase());
+console.log("Includes 'Bell': ", FullName.includes("Bell"));
+console.log("First name: ", FullName.slice(0, 6));
+console.log("Last name: ", FullName.slice(7));
+//Mini Challenge:
+
+function greet(name) {
+    return "Hello, " + name.toUpperCase() + "!";
+}
+
+console.log(greet(FullName));
+
+//  Numbers
+
+
+let num1 = 10;
+let num2 = 3;
+
+console.log("Add:", num1 + num2);
+console.log("Subtract:", num1 - num2);
+console.log("Multiply:", num1 * num2);
+console.log("Divide:", num1 / num2);
+console.log("Remainder:", num1 % num2);
+
+console.log("Rounded:", Math.round(4.6));
+console.log("Random 1-10:", Math.floor(Math.random() * 10) + 1);
+
+// Mini Challenge
+function evenOrOdd(num) {
+  if (num % 2 === 0) {
+    return "Even";
+  } else {
+    return "Odd";
+  }
+}
+
+console.log(evenOrOdd(20));
+
+// arrays
+let students = ["Alvin", "Bertha", "Cole", "Derwin"];
+
+
+for (let i = 0; i < students.length; i++) {
+  console.log(students[i]);
+}
+
+students.push("Evelyn");
+console.log("After push:", students);
+
+students.pop();
+console.log("After pop:", students);
+
+students.unshift("Frank");
+console.log("After unshift:", students);
+
+students.shift();
+console.log("After shift:", students);
+
+// Mini Challenge
+function sumArray(arr) {
+  let sum = 0;
+
+  for (let i = 0; i < arr.length; i++) {
+    sum += arr[i];
+  }
+
+  return sum;
+}
+
+console.log(sumArray([1, 2, 3, 4, 5]));
+
+// Objects
+let car = {
+  brand: "Toyota",
+  model: "Camry",
+  year: 2020
+};
+
+
+console.log(car.brand);
+console.log(car.model);
+console.log(car.year);
+
+
+car.year = 2024;
+
+
+car.color = "Black";
+
+
+for (let key in car) {
+  console.log(key, car[key]);
+}
+
+// Mini Challenge
+function describePerson(person) {
+  return person.name + " is " + person.age + " years old";
+}
+
+let person = {
+  name: "Derwin",
+  age: 20
+};
+
+console.log(describePerson(person));
+
+// Final Challenge
+let student = {
+  name: "Derwin",
+  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";
+}
+
+let average = calculateAverage(student.scores);
+let grade = getGrade(average);
+
+console.log("Name:", student.name);
+console.log("Average:", average);
+console.log("Grade:", grade);
+
+//Reflection
+// The easiest data type for me was strings because the methods are simple to use.
+// The most confusing was objects because accessing and looping through them takes more practice.
+// Arrays store lists of data, while objects store structured data with labels.
+// Arrays are useful for collections, while objects are useful for representing real-world entities.