Terms starting with "T"
Test Coverage Types
PHP 7.0+
Line coverage (lines executed), branch coverage (if/else paths), mutation testing (do tests detect actual bugs) — each measures a different aspect of test quality.
3mo ago
testing intermediate
Test Environment Parity
Dev, staging, and production must use identical PHP versions, MySQL versions, and OS configurations — divergence causes bugs that only appear in production.
3mo ago
testing intermediate
Test Naming Conventions
Well-named tests read as specifications — they document what the system does, make failure messages self-explanatory, and allow filtering tests by feature or scenario.
3mo ago
testing beginner
Time-Series Databases
PHP 5.0+
Databases optimised for storing and querying time-stamped data — metrics, events, sensor readings — with efficient range queries, downsampling, and data retention policies.
3mo ago
database intermediate
Touch Events & Pointer Events
ES2015
Handling touch input on mobile — the Pointer Events API unifies mouse, touch, and stylus into one event model, replacing the need for separate touch and mouse event handlers.
3mo ago
mobile intermediate
Transaction Script Pattern
A pattern where each business operation is a single procedure — simple, linear, and appropriate for straightforward workflows without complex domain logic.
3mo ago
quality intermediate
Translation Management
PHP 5.0+
1
Organising, extracting, and synchronising translatable strings — gettext .po/.mo files, ICU MessageFormat, and tools like Weblate or Crowdin for translator workflows.
3mo ago
i18n intermediate
Tries (Prefix Trees)
PHP 5.0+
A tree where each path from root to node spells a prefix — enabling O(m) insert, lookup, and prefix search where m is the string length, regardless of dictionary size.
3mo ago
data_structures advanced
Type Widening & Covariance/Contravariance
PHP 7.4+
PHP's rules for overriding method types in subclasses — return types are covariant (can narrow), parameter types are contravariant (can widen), enforced since PHP 7.4.
3mo ago
php advanced
Typed Arrays & ArrayBuffer
ES2015
Fixed-type binary arrays (Int32Array, Float64Array, Uint8Array) backed by raw ArrayBuffer memory — essential for WebGL, audio processing, file handling, and Web Workers.
3mo ago
javascript advanced
TypeScript Declaration Files (.d.ts)
2.0
1
Type-only files describing JavaScript code shapes — DefinitelyTyped (@types/* packages) provides community-maintained declarations for popular JS libraries.
3mo ago
typescript advanced
TypeScript Decorators
4.0
1
Metadata annotations on classes, methods, and properties — used in NestJS, Angular, TypeORM, and class-validator to attach behaviour declaratively.
3mo ago
typescript advanced
TypeScript Enums vs Const Enums vs Union Types
2.0
3
Three ways to define a set of named constants in TypeScript — regular enums emit JavaScript, const enums are inlined at compile time, and union types are the idiomatic zero-cost alternative.
3mo ago
typescript intermediate
TypeScript Modules & Namespaces
2.0
2
ES modules (import/export) are the modern standard — namespaces are legacy for global scripts and ambient declarations only.
3mo ago
typescript intermediate
TypeScript vs PHP Type System
4.0
TypeScript uses structural typing (shape compatibility); PHP uses nominal typing (explicit implements). TypeScript infers types; PHP requires annotations. Both support generics (PHP via PHPDoc).
3mo ago
typescript intermediate
Tail Latency (p95, p99)
The latency experienced by the slowest requests — p99 is the response time below which 99% of requests fall, the most user-visible metric.
3mo ago
performance advanced
TCP/IP Model
The four-layer model (Link, Internet, Transport, Application) that describes how data is packaged, routed, and delivered across the internet.
3mo ago
networking intermediate
Technical Debt
PHP 5.0+
2
The accumulated cost of shortcuts, suboptimal decisions, and deferred refactoring — 'debt' that accrues interest over time as it slows development.
3mo ago
quality intermediate
Tell Don't Ask Principle
PHP 5.0+
Tell objects what to do rather than asking for their state and deciding externally — keep behaviour with the data it operates on.
3mo ago
quality intermediate
Template Method Pattern
Defines the skeleton of an algorithm in a base class, deferring specific steps to subclasses without changing the algorithm's structure.
3mo ago
quality intermediate