JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - Exercise Solution - Incrementing and Decrementing

The video tutorial guides viewers through creating a reassignable variable in JavaScript. It begins with an introduction and setup, explaining why 'const' cannot be used for reassignable variables and opting for 'let' instead. The tutorial then demonstrates subtracting a value from a variable and checking the result using console log. It highlights the use of the decrement operator for a more efficient solution. The session concludes with encouragement to practice and enjoy the learning process.

What is the main difference between 'const' and 'let' in JavaScript?

• 'const' is read-only, 'let' can be reassigned

• 'let' is used for constants, 'const' for variables

• 'let' is block-scoped, 'const' is not

• 'const' can be reassigned, 'let' cannot

Which of the following is the correct way to subtract 1 from a variable 'y'?

• y = y / 1

• y = y * 1

• y = y + 1

• y = y - 1

What is the result of the operation 'y = y - 1' if y initially equals 4?

• 5

• 3

• 2

• 4

What is the purpose of the decrement operator in JavaScript?

• To divide a variable's value by 1

• To multiply a variable's value by 1

• To decrease a variable's value by 1

• To increase a variable's value by 1

If 'y' is initially 4, what will be the value of 'y' after applying the decrement operator?

• 3

• 5

• 2

• 4