Data Types

Question 1

What are the 7 primitive Data Types

Answer 1

• Number
• String
• Boolean
• Undefined
• Null
• Symbol(ES2015)
• BigInt(ES2020)

Question 2

What is the typeOf operator in JavaScript?

Answer 2

The type of operator is a special operator used to show the type of a value.

Question 3

Explain the typeOf bug

Answer 3

The typeOf bug is when the typeOf null returns ‘object’.

typeOf null = object

Question 4

Why are variable value datatypes not defined in JavaScript?

Answer 4

This is because JavaScript is dynamically typed.

Question 5

What is the BigInt datatype for?

Answer 5

Larger integers that the Number type can’t hold.