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MVVM Quick Reference

A condensed cheat sheet of MVVM's core components, data flow rules, and platform-specific building blocks for quick lookup.

What Is MVVM?

An introduction to the Model-View-ViewModel pattern and how data binding connects its three layers.

Jest vs Vitest vs Mocha

How Jest compares to Vitest and Mocha in philosophy, speed, and ecosystem so you can pick the right test runner.

Postman vs Insomnia vs curl

Comparing Postman, Insomnia, and curl across usability, collaboration, scripting, and automation to decide which fits a given API workflow.

Cypress vs Selenium vs Playwright

A technical comparison of the three major browser automation tools, covering architecture, language support, speed, and when each is the right choice.

What Is Power BI?

Power BI is Microsoft's business intelligence platform for connecting to data, modeling it, and building interactive reports and dashboards.

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…

sed vs awk vs grep

A comparison of the three classic Unix text tools — when to reach for grep to search, sed to edit streams, and awk for field-oriented and programmable processi…

AWK vs sed vs grep

How the three classic Unix text tools differ in purpose and model, and when to reach for grep for searching, sed for stream editing, or AWK for field-aware pro…

BEGIN and END Blocks

BEGIN runs once before any input is read and END runs once after all input is consumed, giving AWK programs a clean place for setup, headers, and final aggrega…

Running AWK Scripts

There are several ways to run AWK: inline one-liners, program files with -f, and self-executing scripts with a shebang. Knowing each lets you scale from a quic…

Error Handling in Erlang

Erlang handles failure through a distinctive combination of try/catch exception handling and the 'let it crash' philosophy, where supervisors, not defensive co…

Join Algorithms in PostgreSQL

Understand the three physical join strategies PostgreSQL can choose — nested loop, hash join, and merge join — and when each one wins.

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.

Observability in Microservices

How to understand the internal state of a distributed system from the logs, metrics, and traces it produces, so you can debug failures you never anticipated.

The Testing Pyramid

Learn the classic testing pyramid model -- why teams should write many fast unit tests, fewer integration tests, and even fewer slow end-to-end tests.

The GCP Console and gcloud CLI

How to manage Google Cloud resources through the web-based Console, the gcloud command-line tool, and Cloud Shell.

Observability in Kubernetes

Observability in Kubernetes combines metrics, logs, and traces to answer not just whether something is broken, but why, across ephemeral pods and dynamic sched…

Vertical Pod Autoscaling

Understand how VPA right-sizes container CPU and memory requests automatically based on observed usage history.

Multi-Factor Authentication

Understand the categories of authentication factors, how TOTP and WebAuthn work under the hood, and why MFA dramatically reduces account-takeover risk.

Delivery Guarantees in Kafka

The at-most-once, at-least-once, and exactly-once delivery semantics Kafka supports, and the producer/consumer configuration choices that determine which one y…

Kafka Security Basics

Core mechanisms for securing a Kafka cluster: encryption in transit, authentication, and fine-grained authorization.

The TCP Three-Way Handshake

Trace how TCP establishes a reliable connection using the SYN, SYN-ACK, and ACK exchange.

MVVM in Android

How the Model-View-ViewModel pattern maps onto Compose apps, separating UI state, business logic, and data sources into clean, testable layers.