JavaScript Data Types

Question 1

How many data types are used in JavaScript and what are they?

Answer 1

There are 8 data types used in JavaScript, they are:
- Boolean,
- Null,
- Undefined,
- Number,
- Bigint,
- String,
- Symbol,
- Object

Question 2

What is boolean?

Answer 2

Boolean is a data type that can only contain true or false.

Question 3

What is null?

Answer 3

A null value represents a reference that points, generally intentionally, to a non-existent or invalid object or address.

Question 4

What is undefined?

Answer 4

Undefined is a data type that that is automatically assigned to variables that have just been declared, or to formal arguments for which there are no arguments.

Question 5

What is a number?

Answer 5

A number is an integer or a floating point number.

Question 6

What is a BigInt?

Answer 6

A BigInt is an integer with arbitrary precision.

Question 7

What is a string?

Answer 7

A string is a sequence of characters that represent a text value.

Question 8

What is a symbol?

Answer 8

A symbol is a data type whose instances are unique and immutable.

Question 9

What is an object?

Answer 9

An object is a collection of properties.