JS | Primitive Data Types
In this Developer Roadmaps explainer, learn the seven primitive data types that power every JavaScript program — Number, BigInt, String, Boolean, Undefined, Null, and Symbol.
Understand dynamic typing, immutability, type conversion, and how JavaScript represents information under the hood.
Build your foundation for working with objects and complex data next.
🕒 Timestamps / Chapters
00:00 | Intro – What Can Variables Actually Hold?
01:00 | Primitive Data Types – The Atoms of JavaScript
02:00 | Dynamic and Weak Typing Explained
03:00 | Why Understanding Types Prevents Bugs
04:00 | The Seven Primitives Overview
05:00 | Strings – Immutable Text Values
06:30 | Booleans – The Logic of True and False
07:30 | Numbers – Precision, Limits, and maxSafeInteger
09:00 | BigInt – Working with Huge Integers
10:30 | Null vs Undefined – Intentional vs Uninitialized
12:00 | Symbols – The Hidden Unique Identifiers
14:00 | Accessing Symbols with Object.getOwnPropertySymbols
15:00 | Checking Data Types with typeof
16:00 | The typeof null = 'object' Bug
17:00 | Recap – The 7 Immutable Atoms of JavaScript
18:00 | Next Step – Objects: The Molecules of the Language
18:30 | Outro – Map Your Path. Build Your Career.
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