Learn Why

First Principles DSA

"A data structure is not a thing—it's a pattern of memory + rules of access."

WEB

Understanding the browser

Browser and DOM
How the browser actually works
Event Loop, Call Stack & Asynchronous JavaScript
How simple JavaScript schedules thousands of tasks

Foundations

Understanding the machine

Memory Model
How computers store data
CPU & Cache
Why access speed matters
Cost Model
Measuring efficiency

Linear Structures

Data arranged in sequence

Array
Contiguous memory, instant access
Linked List
Movement is cheaper than shifting
Stack
Last in, first out
QueueSoon

Associative Structures

Data accessed by key

Hash TableSoon

Hierarchical Structures

Parent-child relationships

Binary TreeSoon
BSTSoon
HeapSoon

Network Structures

Arbitrary connections

GraphSoon

Free & Open Source

Made with ❤️ for students

Linked Lists

Trade Access for Flexibility

When movement is cheaper than shifting — breaking the contiguous constraint