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Lessons (15)

• SQL Language, Identifiers & Data Types

  Interview answers for DDL/DML/DCL, generated IDs, UNION, static/dynamic SQL and CHAR/VARCHAR. Covers PDF questions …

• Backend Languages: Node.js, Go, Python & Rust

  A friendly tour of the four backend languages in your notes. How each handles concurrency, what it's …

• Domain-Driven Design: Strategic Design

  … Ubiquitous language A ubiquitous language is a shared vocabulary that developers and domain experts use everywhere : in conversations …

• Finding Service Boundaries with DDD

  … Learn bounded contexts, ubiquitous language, aggregates and context maps from Domain-Driven Design. The big idea The word …

• Hexagonal Architecture (Ports & Adapters)

  … No I/O, no frameworks Order , PlaceOrder Port An interface defined by the core , in its own language …

• Domain-Driven Design: Tactical Patterns

  … transactions, repositories, events? ❌ ✅ Named in… Domain language ( ShippingCostCalculator ) Use-case language ( PlaceOrderHandler ) Lives in Domain layer Application layer …

• Event-Driven Architecture

  … 1 }] } } Guideline Why --- --- Past tense, business language ( OrderPlaced , not CreateOrderRow ) Events are facts, in the ubiquitous language Unique …

• React vs Vue vs Angular

  … v-for ) or JSX HTML templates ( @if , @for ) Language JS or TS JS or TS TypeScript (required) Reactivity …

• How a Web Request Works

  … the language of the web An HTTP request is just text: http GET /products/42 HTTP/1.1 …

• Binary Search

  … lo = mid + 1 , hi = mid - 1 Overflow (other languages) (lo + hi) / 2 overflows on huge ints lo + (hi …

• REST vs GraphQL vs gRPC

  … REST GraphQL gRPC --- --- --- --- Style Resources + HTTP verbs Query language, one endpoint Remote procedure calls Format JSON (text) JSON …

• SQL vs NoSQL Databases

  … and inventory correct, and SQL is a universal language. Examples: PostgreSQL, MySQL, SQL Server, SQLite (which this very …

• API Gateway, BFF & Service Discovery

  … Instead of coding this into every service (in every language), a service mesh puts a small proxy ( sidecar …

• Microkernel (Plugin) Architecture

  … Plug-ins --- --- --- VS Code Editor, extension host, APIs Language support, themes, Git tools, linters Web browsers Rendering engine …

• Creational Patterns: How to Make Objects

  … That's this pattern built into the language. Use when: objects are costly to set up (loaded from …