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DREW CAMPBELL
© 2026 Drew Campbell. All rights reserved•Jack of all trades, master of 'some'
Personal Study GuideCase Study

Programming Bible

A structured system for mastering data structures & algorithms

JavaJavaJVM
GitHub Repo
Programming Bible (WIP)

Core Stack

Framework

  • Java

Language

  • Java

Backend

  • Runtime: JVM
  • API: None (library / educational codebase)

Timeline

Nov 2025 — present

Role

Owner / Builder

Links

GitHub Repo

Context

Overview

A structured system for mastering data structures & algorithms.

Problem

Approach

The idea behind the Programming Bible was to build a centralized, scalable system for learning data structures and algorithms—one that goes beyond solving problems and focuses on understanding patterns.

  • Notes (mental models, tradeoffs, patterns)
  • Categorized problems
  • Clean, runnable Java implementations

The goal was to create a repeatable framework for recognizing patterns and improving problem-solving over time.

Key Decisions

The hardest part wasn’t solving problems—it was designing something that avoids common failure points:

  • Fragmentation → notes, code, and problems disconnected
  • Memorization over understanding → solving without pattern recognition
  • Lack of scalability → structure breaking as content grows

On top of that, I had to:

  • Design a folder structure that scales cleanly
  • Ensure Java implementations compile and run consistently
  • Balance clarity (learning) with structure (engineering)

This became less of a coding problem and more of a system design problem for learning.

Design

Topic-Based Architecture

Each data structure is organized into its own module with notes, problems, and solutions.

Pattern-Driven Learning

Focus on reusable patterns like sliding window, two pointers, and hashing.

Runnable Java Codebase

Structured for compilation and execution, not just reference.

Interview-Focused Design

Organized around real interview patterns and decision-making frameworks.

Extensible System

Easy to scale as new topics, problems, and notes are added.

Results

The Programming Bible evolved into a personal system for mastering fundamentals, not just a collection of solutions.

  • A structured approach to interview preparation
  • A growing, reusable reference system
  • Stronger intuition for recognizing patterns quickly

Most importantly, it reinforced my focus on clarity, fundamentals, and long-term learning over short-term problem solving.

DSA categories covered: 6+ (arrays/strings, hash maps, linked lists, stacks/queues, trees, etc.)
Problems documented: 50+ and growing
Patterns captured: 10+ core patterns (sliding window, two pointers, hashmap, recursion, BFS/DFS)
Languages supported: Java (primary), with plans for expansion

Note: metrics reflect ongoing growth of the system, not a fixed dataset.

Reflection

  • Mastering DSA is about patterns, not volume
  • Structure is critical—without it, knowledge doesn’t scale
  • There’s strong overlap between system design and learning design
  • Writing clear explanations deepens understanding more than just coding solutions