Advanced terms
Merkle Tree
PHP 7.0+
A binary tree where each non-leaf node holds the hash of its children, enabling efficient verification that data is intact and untampered.
4mo ago
Data Structures advanced
Metaclass Patterns
Python 3.6+
Metaclasses customize class creation itself — useful for registries, abstract base enforcement, and ORM column collection, but overused where decorators or __init_subclass__ would do.
4mo ago
Python advanced
Mixture of Experts (MoE)
Neural network architecture where a gating network routes each token to a small subset of specialist 'expert' sub-networks, enabling huge total parameter counts at moderate per-token compute cost.
5mo ago
AI / ML advanced
Module Augmentation & Declaration Merging
2.0 Module augmentation lets you extend third-party or global type definitions without modifying their source — adding properties to existing interfaces, modules, or the global scope.
6mo ago
TypeScript advanced
Memory-Mapped Files
A file mapped directly into a process's virtual address space — reads and writes go through the OS page cache rather than read()/write() syscalls, enabling fast access to large files and shared memory between processes.
6mo ago
Linux advanced
Mutex vs Semaphore
PHP 7.0+
1
A mutex allows only one thread to access a resource at a time — a semaphore controls access to a pool of N identical resources.
CWE-362
6mo ago
Concurrency advanced
Memory Barriers & Visibility
1
Memory barriers (fences) force the CPU and compiler to complete memory operations in order — ensuring changes made by one thread are visible to others at the right time.
6mo ago
Concurrency advanced
Memory Leaks — Closures, Detached DOM
ES2015
JavaScript memory leaks occur when references are accidentally retained — common causes: closures holding large objects, detached DOM nodes, forgotten event listeners, and growing Maps/Sets.
6mo ago
JavaScript advanced
Mapped Types & Template Literal Types
2.1
1
Mapped types transform existing types by iterating over their keys. Template literal types create string union types from combinations — together they enable powerful type-level transformations.
6mo ago
TypeScript advanced
Memory Visibility & Cache Coherence
In multi-processor systems, each CPU has a cache — writes by one CPU may not be visible to others without memory barriers. PHP's process-per-request model avoids most visibility issues.
6mo ago
Concurrency advanced
Message Ordering Guarantees
Different message systems provide different ordering: Kafka guarantees order within a partition, SQS Standard does not guarantee order, SQS FIFO guarantees order within a message group.
6mo ago
Messaging advanced
Multi-Cloud vs Single-Cloud
Multi-cloud reduces vendor lock-in but doubles operational complexity — most lock-in comes from cloud-native services not the platform itself.
6mo ago
Cloud advanced
Materialized Views
PHP 5.0+
Pre-computed query results stored as a real table — dramatically faster reads for expensive aggregations at the cost of periodic refresh overhead.
6mo ago
Performance advanced
Microservices
PHP 5.0+
1
An architectural style that structures an application as a collection of small, independently deployable services organised around business capabilities.
6mo ago
Architecture advanced
Model Context Protocol (MCP)
PHP 8.0+
An open standard by Anthropic that defines how AI models connect to external tools and data sources — enabling LLMs to call APIs, read files, and query databases in a standardised way.
6mo ago
AI / ML advanced
Mutation Testing
PHP 7.1+
1
A technique that automatically modifies source code and checks whether tests fail — surviving mutations indicate test gaps even where line coverage appears complete.
6mo ago
Testing advanced