Question 1

Why should I learn data types?

Accepted Answer

Data types are fundamental to understanding how JavaScript stores and manipulates data.

Question 2

How many primitive data types exist in JavaScript?

Accepted Answer

JavaScript has seven primitive data types: String, Number, Boolean, Undefined, Null, BigInt, and Symbol.

Question 3

Are arrays primitive data types?

Accepted Answer

No. Arrays are objects and therefore non-primitive.

Question 4

What is the difference between null and undefined?

Accepted Answer

undefined typically means a value has not been assigned, while null represents an intentional absence of value.

Why should I learn data types?

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