JavaScript Modal and Type Conversion Quiz

What is the return value of the confirm() function when the user clicks the 'Cancel' button in the modal window?

Which of the following functions is used to display a message in a modal window with an input field and buttons for 'OK' and 'Cancel'?

What happens to script execution when a modal window, such as the one used by alert(), appears on the screen?

What is a common use case for checking if a variable is undefined in JavaScript?

What is the return value of the prompt() function if the user cancels the dialog box by pressing the 'Cancel' button?

Which of the following represents the correct way to explicitly convert the value false to a string in JavaScript?

What is the primary purpose of using type conversion functions like String(), Number(), and Boolean() in JavaScript?

What is the result of the following JavaScript expression: true || false || null?

What will be the output of the following JavaScript code?

console.log(undefined || 'hello' || null);

Which of the following is NOT a valid example of short-circuiting in JavaScript?

In the JavaScript expression: 0 && 1 && null && 5, what value is returned?

What is the purpose of the ! operator in Javascript?

Which of the following correctly describes the behavior of the && operator in Javascript?

What is the result of applying the double negation operator (!!) to the value 'hello'?

Given the following code, what is the value of result?

let result = '' || 'hello' || null;

What is the result of the following JavaScript expression: Number('3.14')?

Which of the following values are considered 'falsy' in JavaScript?

What is the result of the following JavaScript expression: Boolean(' ')?

What is the output of the following JavaScript code: let x = 5; x *= 2; console.log(x);?

Which of the following expressions demonstrates the use of the exponentiation operator in JavaScript?

What is the result of the following JavaScript code snippet: let y = 10; y--; console.log(y);?

What is the difference between ++x (prefix increment) and x++ (postfix increment)?

What is the purpose of the 'remainder' operator (%) in JavaScript?

What is the output of the following code snippet?

for (let i = 0; i < 3; i++) {
  console.log(i);
}
console.log(i);

Which of the following code snippets represents an infinite loop?

In a for loop, what is the purpose of the step part (third section)?

Which of these loops is ideal for situations where the loop body must execute at least once, regardless of the initial condition?

Which statement about the variable scope in a for loop is TRUE?

What is the result of 'Glow' > 'Glee'?

What is the value of x after the following code executes: let x = 5; x++;?

Which of the following statements is true regarding the precedence of the increment/decrement operator?

Which of the following expressions will return true?

What is the result of the following code snippet: let x = 10; let y = x++ + 5;?

Which of these options demonstrates a best practice for comparing values in JavaScript?

How can you use the ternary operator to execute code based on a condition without assigning a value?

What does the following code snippet do? let result = condition ? value1 : value2;?

What will be the output of the following line of JavaScript code: console.log(!!'hello');

In the expression true || false && false, which operator is evaluated first, based on operator precedence?

What is the primary purpose of the !! operator in JavaScript?

Which of the following statements about JavaScript loops is incorrect?

In the following code snippet, how many times will the loop execute?

let i = 0;
while (i < 3) {
console.log(i);
i++;
}

What is the primary difference between a while loop and a do…while loop in JavaScript?

Given the code: for (let i = 1; i < 5; i += 2) { console.log(i); }, what will be the output?

Which of these statements about JavaScript loops is true?

What is the result of the JavaScript expression Boolean(' ')?

What is the primary purpose of the JavaScript typeof operator?

Which of the following statements correctly describes the behavior of the prompt() function in JavaScript?

When a modal window, like the one used by alert(), appears in a browser, what happens to the execution of JavaScript code?

What is the primary difference between the alert() and confirm() functions in JavaScript?

Which of the following is a key point to remember about modal windows in JavaScript?

What is the purpose of using type conversion functions, such as String() and Number(), in JavaScript?

Which of the following is NOT a valid example demonstrating JavaScript's automatic type conversion?

What is the result of the following JavaScript expression: String(false)?

Which of the following statements regarding variable scope within a for loop is TRUE?

What is a key difference between a while loop and a do...while loop?

In a for loop, what does the step part (third section) primarily control?

Which of the following statements about infinite loops is FALSE?

Given the following code: for (let i = 1; i < 5; i += 2) { console.log(i); }, what will be the output?

In the context of JavaScript logical operators, which of the following statements accurately describes the behavior of the OR operator (||)?

What is the primary purpose of using the !! operator (double NOT) in JavaScript?

Which of the following correctly describes the short-circuiting behavior of the AND operator (&&) in JavaScript?

Given the JavaScript expression null || 'Hello' || 0, what is the resulting value?

Assuming you have a variable called age which holds an integer value, which of the following JavaScript code snippets would you use to set a status variable to 'Adult' if the age is 18 or greater, and 'Child' otherwise?

What is the primary purpose of the else if construct in JavaScript?

What does short-circuiting refer to in the context of JavaScript logical operators?

In the following JavaScript code snippet, what will be the value of result?

let result = true && 0 && 'hello';

What would be the value of x after this code runs? const x = 10; x = 20;

What is the correct syntax to define a constant representing the value of Pi in JavaScript?

Which of the following would be considered a good practice for using variables in JavaScript?

Which data type in JavaScript represents a number with decimal places?

What is the purpose of the NaN value in JavaScript?

Which of the following correctly represents a string in JavaScript?

What is the difference between the null and undefined values in JavaScript?

What is the purpose of the typeof operator in JavaScript?

What is the result of the following JavaScript expression: 'Glow' > 'Glee'?

Which of the following expressions demonstrating the use of ++ or -- will return the original value of the variable before the increment or decrement happens?

In JavaScript, null == undefined evaluates to true. What about null === undefined?