Javascript Lab 2 Complete

js-data-types-lab/lab.js

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+let fullName = "Fred Ainsworth";
+
+console.log(fullName.length);
+console.log(fullName.toUpperCase());
+console.log(fullName.includes("Ainsworth"));
+console.log(fullName.slice(0, 4));
+
+function greet(fullName) {
+  let NAME = fullName.toUpperCase();
+  console.log("Hello, " + NAME + "!");
+}
+
+//The .length property returns the number of characters in a string, including spaces and punctuation. 
+// The .includes() method checks if a string contains a specified substring and returns true or false.
+// The .slice() method extracts a section of a string and returns it as a new string.
+
+//Practice 2: Numbers
+let num1 = 10;
+let num2 = 3;
+console.log(num1 + num2);
+console.log(num1 - num2);
+console.log(num1 * num2);
+console.log(num1 / num2);
+console.log(num1 % num2);
+console.log(Math.round(3.7));
+console.log(Math.random()*10)+1;
+
+function oddOrEven(num) {
+  if (num % 2 === 0) {
+    return "Even";
+  } else {
+    return "Odd";
+  }
+}
+
+//% is the modulus operator, which returns the remainder of a division operation.
+//Math.random() generates a random decimal number between 0 (inclusive) and 1 (exclusive). By multiplying it by 10 and adding 1, we can get a random number between 1 and 10.
+//Math.floor() rounds a number down to the nearest whole number
+
+let students = ["Alice", "Bob", "Charlie", "David"];
+
+for (let i = 0; i < students.length; i++) {
+  console.log(students[i]);
+}
+
+students.push("Eve");
+students.pop("David");
+console.log(students.length);
+
+function arraySum(students) {
+  let sum = 0;
+  for (let i = 0; i < students.length; i++) {
+    sum += students[i];
+  }
+  return sum;
+}
+// Access arrays by their index or using a loop to iterate through the elements.
+// The .push() method adds an element to the end of an array
+// We use loops with arrays to iterate through the elements. 
+
+let car = {
+  make: "Toyota",
+  model: "Camry",
+  year: 2020,
+};
+
+car.year = 2021;
+car.color = "red";
+console.log(car);
+
+for (let key in car) {
+  console.log(key + ": " + car[key]);
+}
+
+function describePerson(person) {
+  return person.name + " is " + person.age + " years old";
+}
+// A key-value pair is a fundamental unit in objects, where each piece of data is stored as a property name (key) and its associated value.
+//You access object data using dot notation (e.g., object.key) or bracket notation (e.g., object['key']).
+//Use an object instead of an array when you need to store structured data with named properties (e.g., a person's details like name and age), rather than an ordered list of similar items.
+
+let student= {
+    name: "John",
+    scores: [80,90,75,100],
+    };
+
+let sum = 0;
+for (let i = 0; i < student.scores.length; i++) {
+  sum += student.scores[i];
+}
+let average = Math.round(sum / student.scores.length);
+
+let grade;
+if (average >= 90) {
+  grade = "A";
+} else if (average >= 80) {
+  grade = "B";
+} else if (average >= 70) {
+  grade = "C";
+} else if (average >= 60) {
+  grade = "D";
+} else {
+  grade = "F";
+}
+
+console.log("Name: " + student.name);
+console.log("Average: " + average);
+console.log("Grade: " + grade);
+
+//Strings felt easiest because they are straightforward to manipulate with methods like length, toUpperCase, includes, and slice.
+//Some of the math operations were a bit tricky at first, like the random number generation.
+//Objects were the most confusing at first, as they involve key-value pairs and require understanding properties and methods.
+//Arrays are ordered collections of items accessed by index, while objects are unordered collections of key-value pairs accessed by keys.
+//Use arrays for lists of similar items, like a list of student names. Use objects for structured data with named properties, like representing a car with make, model, and year.