Logical Operator

What is the primary function of logical operators in JavaScript?

• To combine or modify Boolean values, enabling more complex conditional decisions.

• To loop through arrays.

• To define new variables.

• To perform arithmetic calculations.

Consider the expression (5 > 3 && 10 < 20). What will this expression evaluate to?

• 3

• false

• 10

• true

Which logical operator returns true only if all of its operands are true?

• && (AND)

• || (OR)

• ! (NOT)

• ?? (Nullish Coalescing)

Which logical operator returns true if at least one of its operands is true?

• && (AND)

• ! (NOT)

• || (OR)

• === (Strict Equality)

What will the expression (false || true || false) evaluate to?

• false

• true

• null

• undefined

Given let isRaining = true;, what will !isRaining evaluate to?

• true

• false

• undefined

• null

You want to check if a user is not logged in. If isLoggedIn is a boolean variable, which condition would you use?

• if (isLoggedIn === false)

• if (!isLoggedIn)

• if (isLoggedIn == 0)

• All of the above are equally common and readable.

Which of the following scenarios is best handled using the && (AND) operator?

• Granting access if a user is an administrator OR a manager.

• Displaying a message if a number is less than 0 OR greater than 100.

• Checking if a variable's value falls within a specific range (e.g., between 10 and 20).

• Toggling a boolean flag.

Combining multiple conditions using logical operators (&&, ||) generally leads to:

• More nested if statements.

• Longer and less readable code.

• More concise and enhanced decision-making in code.

• Slower program execution.

What will be the output of the following code as shown in the image below?

• "Eligible for special program."

• "Not eligible."

• undefined

• Error