Data Types and Variables

Which one of the following can we use to declare a variable in JS?

• const

• let

• var

• all of the options

which of the following is a primitive data type in JS

• object

• array

• string

• function

What is the default value of a variable in JavaScript if it's not assigned any value?

• null

• undefined

• 0

• NaN

Select all the valid data types in JS

• string

• boolean

• int

• char

• number

Simi wants to record her age using JS which of the following statement is correct?

• let simiAge : 10;

• let simiAge = 10;

• let simiAge :=10;

• let simiAge - 10;

What keyword can we use to check if data type of a value in JS

• dataTypeof

• typeof

• data

• type

Abraham Morenike wants to separate her name to first name and last name, what string method can she use?

• separate()

• section()

• split()

• divide()

what does NaN mean?

• Not a Name

• Number a Name

• Not A Number

• Name a Number

Adamu is declaring a variable but as he keeps writing more code, he might change the value of that variable. What keyword should he use?

• const

• let

• int

• update

Which method is used to convert a string to lowercase in JavaScript?

• toLowerCase()

• lowerCase()

• caseLower()

• convertToLower()