Terms starting with "D"
Divergent Change
One class changes for many different reasons — a sign it has too many responsibilities.
6mo ago
Code Quality intermediate
DNS Rebinding Attack
PHP 5.0+
An attacker tricks a browser into associating their malicious domain with an internal IP, bypassing same-origin policy to reach internal services.
CWE-350 OWASP A1:2021
6mo ago
Security advanced
8.8
DNS Record Types
DNS records map domain names to various targets — A (IPv4), AAAA (IPv6), CNAME (alias), MX (mail), TXT (verification/SPF), SRV (services), and NS (nameservers).
6mo ago
Networking intermediate
DNS Resolution
1
The process of translating a human-readable domain name into an IP address via a hierarchy of DNS servers.
6mo ago
Networking intermediate
Documentation as Code
4
Treating documentation with the same discipline as code — version controlled, reviewed in pull requests, tested for accuracy, and kept close to the code it describes.
6mo ago
General beginner
DOM-Based XSS
ES5
2
Malicious script is injected and executed via the browser DOM without any server-side involvement.
CWE-79 OWASP A3:2021
6mo ago
Security intermediate
6.1
Domain Events
PHP 7.0+
5
Named, immutable records of something that happened in the domain — 'OrderPlaced', 'PaymentReceived' — enabling decoupled reactions without direct service calls.
6mo ago
Architecture advanced
Domain-Driven Design (DDD)
PHP 5.0+
3
An approach to software development that focuses on modelling the core domain using the language and concepts of domain experts.
6mo ago
Architecture advanced
DORA Metrics
PHP 5.0+
1
Four metrics from the DevOps Research and Assessment team that predict software delivery performance: deployment frequency, lead time, change failure rate, and time to restore.
6mo ago
DevOps intermediate
Duplicate Code
PHP 5.0+
Identical or near-identical blocks of code in multiple places — the most common source of maintenance bugs.
6mo ago
Code Quality beginner
Dynamic Analysis (DAST)
Testing a running application by sending crafted inputs to discover vulnerabilities that only manifest at runtime.
6mo ago
General intermediate
Dynamic Programming
PHP 5.0+
1
An optimisation technique that solves problems by breaking them into overlapping subproblems, storing results to avoid redundant computation.
6mo ago
Algorithms advanced
Dependency Injection
PHP 5.0+
3
Passing dependencies into a class rather than creating them inside — makes classes testable and loosely coupled.
7mo ago
Code Quality intermediate
DRY Principle
PHP 5.0+
Don't Repeat Yourself — every piece of knowledge should have a single, unambiguous representation in the codebase.
7mo ago
Code Quality beginner