Semester 1 Exam Review

Which of the following is used to declare a variable in JavaScript?

• var

• let

• const

• All of the above

Which symbol is used for single-line comments in JavaScript?

• //

• /*

• */

• #

What does NaN stand for in JavaScript?

• Not a Number

• Not a Null

• Not a Name

• Null and None

What will 5 == "5" return?

• TRUE

• FALSE

• undefined

• null

What will 5 === "5" return?

• TRUE

• FALSE

• undefined

• null

Which operator checks both value and type in JavaScript?

• ==

• =

• ===

• !==

How do you convert a string to an integer in JavaScript?

• parseInt()

• toString()

• Number()

• stringify()

How do you declare a constant in JavaScript?

• const

• var

• let

• constant

Which of the following is a valid JavaScript variable name?

• 2ndVariable

• first-name

• myVariable

• my Variable

Can a variable name start with a number in JavaScript?

• Yes

• No

• Only if it's a constant

• Only if it's a function