Understanding data types is one of the first and most important steps when learning JavaScript. Data types tell the browser what kind of value a variable holds, and how it should be treated. Without this knowledge, even the simplest JavaScript programs can become confusing.
Thankfully, there are many types of tutorials available to help you learn JavaScript data types, each catering to different learning styles. Whether you prefer reading, watching videos, coding hands-on, or building projects, there’s a tutorial out there for you.
What Are JavaScript Data Types?
JavaScript has two main categories of data types: primitive and non-primitive.
Primitive Data Types:
These are simple, single-value types.
String– Text (e.g.,"Hello")Number– Numeric values (e.g.,42,3.14)Boolean– True or falseUndefined– A variable declared but not assignedNull– An intentionally empty valueSymbol– Unique and immutable value (used mostly in advanced code)BigInt– For very large integers beyond regular Number limits
Non-Primitive (Reference) Data Types:
These can store collections or more complex data.
Object– A collection of key-value pairsArray– A list-like structure of valuesFunction– A block of reusable code
Knowing how these data types behave — and how to check them with typeof — is essential for writing reliable code.
Types of JavaScript Data Type Tutorials
1. Text-Based Beginner Tutorials
Text tutorials are perfect for beginners who want to read and take notes at their own pace. These often explain each data type with examples and simple syntax.
Best platforms:
- W3Schools
- JavaScript.info
- MDN Web Docs (Mozilla)
These tutorials often include code snippets, quizzes, and explanations of how data types are stored and compared.