Pattern

The RelayCommand Pattern

A reusable ICommand implementation that wraps Execute and CanExecute delegates, eliminating the need to write a bespoke command class for every ViewModel actio…

The MVC Architecture Pattern

A deep dive into how Model, View, and Controller responsibilities are divided in ASP.NET MVC, and why that separation matters for testability and maintainabili…

Repository Pattern in MVC

How the repository pattern abstracts data access behind interfaces, decoupling MVC controllers from Entity Framework and improving testability.

The MVC Pattern in ASP.NET Core

Understand how ASP.NET Core implements Model-View-Controller, separating request handling, business/data concerns, and presentation into distinct, testable lay…

Repository Pattern in ASP.NET Core

How to abstract data access behind repository interfaces in ASP.NET Core, and when that abstraction is worth the added indirection over EF Core directly.

Response Assertions

Learn how JMeter's Response Assertion element validates sample responses against text, regex, and status-code patterns so failures are caught automatically ins…

The MVVM Pattern

Understand how Model-View-ViewModel separates UI from business logic in .NET MAUI, using CommunityToolkit.Mvvm's ObservableObject and RelayCommand to keep code…

Building a Trigger Handler

How to structure a one-trigger-per-object handler class with context-specific methods, recursion guards, and safe use of Trigger context variables.

The Hold and Pattern Space

sed maintains two buffers, the pattern space and the hold space, and a handful of commands move data between them to enable multi-line and stateful edits.

AWK Pattern-Action Syntax

Every AWK program is a sequence of pattern { action } rules. Understanding how patterns select lines and actions transform them is the core mental model of the…

Patterns and Regular Expressions

AWK programs are pattern-action pairs; patterns can be regular expressions, relational tests, or ranges that decide which records an action runs on.

The Builder Pattern in Groovy

See how Groovy's closures enable natural DSL-style builders, how to hand-write a fluent builder, and how @Builder auto-generates builder scaffolding for you.

Pattern Matching in F#

Understand how F#'s match expression destructures values, enforces exhaustiveness, and replaces verbose conditional logic with concise, type-safe branching.

Binary Pattern Matching

Erlang's bit syntax lets you construct and deconstruct binary data with precise, declarative pattern matches, making it a natural fit for parsing network proto…

Guards and Clauses

How Erlang guards extend pattern matching with safe boolean conditions to express multi-way branching without if/else.

Pattern Matching in Erlang

How Erlang's = operator, function clauses, and guards use pattern matching to bind variables and control program flow.

Pattern Matching in Elixir

How Elixir's = operator performs structural pattern matching rather than simple assignment, and how that idea powers destructuring, function clauses, and contr…

Pattern Matching in Haskell

Learn how Haskell lets you destructure values directly in function definitions and case expressions to write clear, exhaustive branching logic.

Pattern Matching in Depth

Go beyond basic match expressions to guards, type patterns, list deconstruction, custom extractors, and compiler-checked exhaustiveness over sealed hierarchies.

Publish-Subscribe Pattern

Learn how RabbitMQ's fanout exchange implements publish-subscribe messaging, decoupling producers from any number of independent subscribers.

RPC Pattern with RabbitMQ

Learn how to implement request/response Remote Procedure Calls over RabbitMQ using reply-to queues and correlation IDs.

API Gateway Pattern

Learn how an API Gateway acts as the single entry point for microservices, handling routing, authentication, rate limiting, and aggregation.

Bulkhead Pattern

A resilience pattern that isolates resources per dependency or workload so that failure or saturation in one area can't sink the entire service.

Circuit Breaker Pattern

A fault-tolerance pattern that stops a service from repeatedly calling a failing dependency, giving it time to recover and preventing cascading failures.

Scala Cheat Sheet

Scala syntax, case classes, pattern matching, immutable collections, and functional programming features that run on the JVM.

Elixir Cheat Sheet

Elixir syntax, pattern matching, pipe operators, and OTP concurrency primitives for building fault-tolerant BEAM applications.

Serverless Architecture Cheat Sheet

Design patterns, tradeoffs, and best practices for building event-driven serverless applications across cloud providers.

AWS EventBridge Cheat Sheet

Event bus rules, patterns, schedules, and SDK snippets for routing events between AWS services and SaaS apps.