#State Pattern — ByteDepth

Low Level Design

State Pattern — Object Behaviour That Changes with State

How the State pattern replaces complex state-based conditionals with dedicated state classes, making transitions explicit and individual states independently testable.

Aug 26, 2026·9 min read

Low Level Design State Pattern Design Patterns

Low Level Design

Design a Traffic Signal Controller

A complete low-level design walkthrough for a traffic signal control system — State pattern for signal transitions, Singleton context as the FSM, and sensor-driven adaptive durations with emergency override.

Easy·Aug 11, 2026·12 min read

Low Level Design OOP Design Patterns

Low Level Design

Design a Coffee Vending Machine

A complete low-level design walkthrough for a coffee vending machine — Singleton services, Factory for coffee types, synchronized thread safety, and inventory tracking with low-stock alerts.

Easy·Aug 11, 2026·15 min read

Low Level Design OOP Design Patterns