Study

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Study

core

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core topics

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JavaScript Core Fundamentals

1. Execution Model & Event Loop

Call Stack
Heap
Execution Context
Lexical Environment
Microtask Queue
Macrotask / Task Queue
Event Loop
Promise vs Timer Scheduling
Event Loop Blocking
Browser Event Loop vs Node.js Event Loop

2. JavaScript Engine, Runtime & JIT

ECMAScript vs Runtime APIs
JavaScript Engine
JavaScript Runtime
V8
Parsing
AST
Bytecode
Interpreter
JIT Compilation
Hot Code Paths
Optimization
Deoptimization
Hidden Classes / Object Shapes
Inline Caching

3. Scope, Closures & Runtime State

Scope Chain
Lexical Scope
Closures

programming-language-concepts.md

zero-language-explanation.md

DB

Quick

databases-deep-dive.md

01-introduction.md

02-relational-databases.md

03-database-design.md

05-transactions-acid.md

06-nosql-databases.md

07-query-optimization.md

08-replication-ha.md

09-sharding-partitioning.md

10-caching-strategies.md

11-cap-theorem.md

12-connection-pooling.md

13-backup-recovery.md

14-monitoring.md

15-database-selection.md

JS

Merlin Backend

01-Orchestration.md

02-DeepResearch.md

05-Streaming.md

06-MultiProviderLLM.md

07-MemoryAndContext.md

08-ErrorHandling.md

09-RateLimiting.md

10-TaskQueue.md

11-SecurityAndAuth.md

Orchestration-2nd-draft

Mobile

Build Alternative

metro-bundler-deep-dive.md

OpenAI Agents Python

01_AGENT_SYSTEM.md

02_RUNNER_SYSTEM.md

03_TOOL_SYSTEM.md

04_ITEMS_SYSTEM.md

05_GUARDRAILS.md

07_MEMORY_SESSIONS.md

08_MODEL_PROVIDERS.md

09_SANDBOX_SYSTEM.md

11_RUN_STATE.md

13_LIFECYCLE_HOOKS.md

14_CONFIGURATION.md

15_ERROR_HANDLING.md

16_STREAMING.md

17_EXTENSIONS.md

18_MCP_INTEGRATION.md

19_BEST_PRACTICES.md

20_ARCHITECTURE_PATTERNS.md

opencode-study

context-handling

Python

sqlalchemy - fastapi

SQLAlchemy overview

tweets

system_design_for_agentic_apps.md

Captured State

Stale Closures

Retained Closures

this Binding

Arrow Function this

4. Promises, Async/Await & Concurrency

Promise States
Microtasks
Promise Chaining
async / await
Parallel vs Sequential await
Error Propagation
Unhandled Rejections
Promise.all
Promise.allSettled
Promise.race
Promise.any
AbortController
Timeouts
Cancellation

5. Memory Management

Stack vs Heap
Object References
Reachability
Garbage Collection
Memory Leaks
Event Listener Leaks
Timer Leaks
Closure Leaks
Map vs WeakMap

6. Prototype Chain & Object Model

[[Prototype]]
Prototype Chain
Constructor Functions
prototype
Class Syntax
Method Lookup
Own Properties vs Inherited Properties
Object.create
Prototype Pollution

7. Modules & Dependency Graphs

ES Modules
CommonJS
Static Imports
Dynamic Imports
Named Exports
Default Exports
Live Bindings
Module Caching
Circular Dependencies
Side-Effectful Modules
Tree Shaking

8. Runtime Type System & Data Correctness

Primitive Values
Reference Values
typeof
instanceof
Array.isArray
null
undefined
NaN
Symbol
BigInt
Number Precision
Safe Integers
Runtime Validation
JSON Boundaries
TypeScript Types vs Runtime Values

9. Mutability, Copying & State Safety

Shared References
Mutation
Shallow Copy
Deep Copy
structuredClone
Object.freeze
Immutability
Pure Functions
Explicit Side Effects
Defensive Copying

10. Streams & Backpressure

Readable Streams
Writable Streams
Transform Streams
Chunks
Buffering
Piping
Backpressure
Streaming Responses
Large Data Handling

11. Error Handling & Failure Boundaries

throw
try/catch
Custom Errors
Error.cause
Async Errors
Promise Rejections
Operational Errors
Programmer Errors
Fail-Fast Errors
Recoverable Errors

12. JavaScript Security Footguns

Prototype Pollution
Unsafe Object Merging
eval
Dynamic Code Execution
XSS Risks
Client-Side Secret Leaks
Unsafe Deserialization
Dependency Supply Chain Risk

13. JavaScript Code Design Patterns

Module Boundaries
Pure Core, Imperative Shell
Dependency Injection
Factory Functions
Strategy Pattern
Adapter Pattern
Middleware Pattern
Event-Driven Design
Explicit Side Effects
Predictable Data Flow
Boring, Readable Code