Boolean Logic, Comparison Operators, and Loops Review Flashcard

Front

What does the && (AND) operator return when both conditions are true?

Back

true

Answer explanation

The && (AND) operator returns true when both conditions are true. Since Michael and Harper will picnic only if the weather is sunny and they both have a day off, both conditions being true results in true.

Front

Zoe is deciding whether to go for a walk. She will only go if it is sunny and not raining. What is the result of it being sunny && raining?

Back

She will not go for a walk

Answer explanation

Zoe will not go for a walk because the condition requires it to be sunny and not raining. Since it is raining, the condition is not met.

Front

What is the result of !(true)?

Back

false

Answer explanation

The expression !(true) uses the logical NOT operator, which negates the value. Since true is being negated, the result is false. Therefore, the correct answer is false.

Front

What is the output of the following JavaScript code?
let x = 10;
console.log(x != 10);

Back

false

Answer explanation

The code checks if x (10) is not equal to 10 using the '!=' operator. Since 10 is equal to 10, the expression evaluates to false. Therefore, the output is false.

Front

What will console.log(5 > 3 && 8 < 10); print?

Back

true

Answer explanation

The expression '5 > 3' evaluates to true and '8 < 10' also evaluates to true. The '&&' operator requires both conditions to be true, so 'true && true' results in true. Therefore, console.log(5 > 3 && 8 < 10) prints true.

Front

In JavaScript, the expression 5 > 3 && 8 < 10 evaluates to ____.

Back

true

Answer explanation

The expression 5 > 3 evaluates to true and 8 < 10 also evaluates to true. Since both conditions are true, the entire expression 5 > 3 && 8 < 10 evaluates to true.

Front

The correct syntax for an if statement in JavaScript is ____.

Back

if (condition) {}

Answer explanation

The correct syntax for an if statement in JavaScript is B) if (condition) {}. This format uses parentheses to enclose the condition and curly braces to define the block of code that executes if the condition is true.

Front

What is the purpose of an else statement?

Back

To execute code only if the condition is false

Answer explanation

The else statement is used to execute code when the preceding condition is false. Therefore, the correct choice is B) To execute code only if the condition is false.

Front

In JavaScript, the else statement is used to execute code when the if condition is ____.

Back

false

Answer explanation

The else statement in JavaScript is executed when the if condition is false. Therefore, the correct choice is B) false, as it allows for alternative code execution when the initial condition does not hold.

Front

What is wrong with this code? if (5 > 3); console.log("Hello");

Back

The semicolon ends the if statement prematurely

Answer explanation

The semicolon after the if statement ends it prematurely, causing the console.log to execute unconditionally. This means 'Hello' will always be logged, regardless of the condition.