JavaScript Essentials

Table of Contents

Note:

The questions are shortened for a cleaner view
Questions that are straightforward will only have answers attached. Such questions can be easily answered by reading the documentation given in the room.

Task 1 - Introduction
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No answer needed

Task 2 - Essential Concepts
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1) What term allows you to run a code block multiple times?
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Ans: loop

Loops allow you to run a code block multiple times as long as a condition is true.

Task 3 - Javascript Overview
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1) What is the code output if the value of x is changed to 10?
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Ans: The result is: 20

2) What term describes registering domain names that are misspelt ?
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Ans: Interpreted

JS is an interpreted language, meaning the code is executed directly in the browser without prior compilation.

Task 4 - Integrating JavaScript in HTML
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1) Which type of JavaScript integration…?
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Ans: Internal

2) Which method is better for reusing JS across multiple web pages?
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Ans: External

3) What is the name of the external JS file…?
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Ans: thm_external.js

4) What attribute links an external JS file in the `<script>` tag?
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Ans: src

Task 5 - Abusing Dialogue Functions
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1) In the file invoice.html…?
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<!DOCTYPE html>
<html lang="en">
<head>
    <title>Hacked</title>
</head>
<body>
    <script>
        for (let i = 0; i < 5; i++) {
            alert("Hacked");
        }
    </script>
</body>
</html>

Ans: 5

2) Which of the JS interactive elements should be used to display…?
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Ans: prompt

3) If the user enters Tesla, what value is stored in the carName…?
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The entered value is what will be stored

Ans: Tesla

Task 6 - Bypassing Control Flow Statements
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1) What is the message displayed if you enter the age less than 18?
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<!DOCTYPE html>
<html lang="en">
<head>
    <title>Age Verification</title>
</head>
<body>
    <h1>Age Verification</h1>
    <p id="message"></p>

    <script>
        let age = prompt("What is your age")
        if (age >= 18) {
            document.getElementById("message").innerHTML = "You are an adult.";
        } else {
            document.getElementById("message").innerHTML = "You are a minor.";
        }
    </script>
</body>
</html>

Ans: You are a minor.

2) What is the password for the user admin?
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<!DOCTYPE html>
<html lang="en">
<head>
    <title>Login Page</title>
</head>
<body>
    <h2>Login Authentication</h2>

    <script>
        let username = prompt("Enter your username:");
        let password = prompt("Enter your password:");

        if (username === "admin" && password === "ComplexPassword") {
            document.write("You are successfully authenticated!");
        } else {
            document.write("Authentication failed. Incorrect username or password.");
        }
    </script>
</body>
</html>