[pull] master from leonardomso:master #62
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- Add fact-check skill for verifying technical accuracy of concept pages - Add seo-review skill for SEO audits with 27-point scoring system - Move skills to both .claude/skills and .opencode/skill for compatibility - Rename opencode.json to opencode.jsonc with skill configuration - Update .gitignore to track .opencode/skill while ignoring local files - Update CLAUDE.md with documentation for all three skills
- Fix Fireship video title to match actual YouTube title - Fix javascript.info anchor to correct section heading - Add internal links to Scope and Closures, JavaScript Engines, and TDZ - SEO score: 27/27 (100%)
- Add 3,700+ word guide covering TDZ fundamentals, edge cases, and pitfalls - Include 47 Vitest tests validating all code examples - Cover let/const/class TDZ, typeof behavior, destructuring, loops, ES modules - Add restaurant reservation analogy and ASCII diagrams for visualization - Optimize for SEO with featured snippet targeting (score: 27/27) - Include 10 key takeaways and 6 Q&A sections for learning reinforcement
- Add test-writer skill for generating Vitest tests from code examples - Add resource-curator skill for finding and maintaining external resources - Add concept-workflow skill to orchestrate all 5 skills end-to-end - Update opencode.jsonc with permissions for new skills - Update CLAUDE.md with documentation for all new skills Skills now provide complete workflow: 1. resource-curator: Find quality resources 2. write-concept: Write documentation 3. test-writer: Generate tests 4. fact-check: Verify accuracy 5. seo-review: Optimize SEO 6. concept-workflow: Run all 5 in sequence
- Add comprehensive strict-mode concept page (27 tests passing) - Covers what strict mode does, how to enable it, and key restrictions - Includes SEO optimization with internal links and meta description - Add comprehensive property-descriptors concept page (50 tests passing) - Covers writable, enumerable, configurable flags - Object.defineProperty(), accessor descriptors, object-level protections - Fixed broken external links (freeCodeCamp, DigitalOcean) Both pages reviewed with write-concept, fact-check, and seo-review skills.
- Add Technical SEO Checklist section (3 points): - Single H1 per page - URL slug contains keyword - No orphan pages - Update scoring system from 27 to 30 total points - Add Technical SEO Issues table with common fixes - Update report template with Technical SEO analysis section - Update CLAUDE.md with new scoring reference
- Add full concept documentation (1,214 lines, ~4,200 words) - Cover object literals, classes, Object.defineProperty() syntax - Include vending machine analogy with ASCII diagram - Document infinite recursion prevention pattern - Add 5 common use cases with code examples - Cover inheritance, performance, and JSON.stringify behavior - Add 49 passing tests covering all concepts and edge cases - SEO optimized: score 29/30 with featured snippet ready definition - Include 11 external resources (4 MDN, 4 articles, 3 videos)
Add comprehensive documentation covering: - JavaScript's dynamic typing vs static typing (TypeScript, Rust, Java) - null vs undefined semantics and when to use each - Short-circuit evaluation with &&, ||, ??, and ?. - typeof operator quirks including the typeof null bug - instanceof and Symbol.hasInstance customization - Symbols for unique identifiers and well-known symbols - BigInt for arbitrary precision integers Includes 85 passing tests covering all code examples.
…ith tests - Cover Object.keys(), values(), entries(), fromEntries() for iteration - Explain shallow vs deep cloning (assign vs structuredClone) - Document hasOwn(), Object.is(), and Object.groupBy() (ES2024) - Include object inspection and protection methods - Add 40 Vitest tests covering all code examples
… with tests - Cover all 13 proxy handler traps with detailed explanations - Include practical patterns: validation, observable data, access control, logging - Add revocable proxies and limitations sections (Map/Set internal slots, private fields) - Create 23 passing tests for all code examples - Add curated resources: 3 MDN refs, 4 articles, 3 videos - SEO optimized with question hook, featured snippet definition, internal linking
- Add 986-line documentation covering WeakMap and WeakSet fundamentals - Include real-world use cases: private data, caching, memoization, tracking - Add comparison tables for Map vs WeakMap and Set vs WeakSet - Cover ES2023+ Symbol keys feature - Add 46 passing Vitest tests for all code examples - Complete 5-phase concept-workflow (SEO score: 30/30)
…page with tests - Add complete memory management documentation covering: - Memory lifecycle (allocate, use, release) - Stack vs heap allocation with visual diagrams - Garbage collection and mark-and-sweep algorithm - Common memory leak patterns with fixes - WeakMap, WeakSet, and WeakRef usage - Chrome DevTools memory profiling guide - Best practices for memory-efficient code - Add 34 tests covering memory allocation, references, WeakMap/WeakSet, memory leak patterns, object pools, and cleanup patterns - Include 4 MDN references, 4 articles, and 4 video resources - SEO optimized: 4,420 words, 30/30 SEO score
- Add full garbage collection concept page (~2500 words) - Cover mark-and-sweep algorithm, reachability, generational GC - Include ASCII diagrams and code examples - Add 25 Vitest tests covering reachability, circular refs, WeakRef, caching - Curate resources: 3 MDN refs, 5 articles, 4 videos - SEO optimized (30/30 score)
- Complete rewrite of memoization.mdx from placeholder stub (52 → 868 lines) - Add 23 tests covering all code examples in memoization.test.js - Cover building memoize functions, recursive optimization, WeakMap usage - Include common mistakes, LRU cache pattern, and when not to memoize - SEO optimized with proper keywords, meta description, internal links
- Complete rewrite of stub page into 4,000+ word guide - Cover debounce vs throttle with visual diagrams - Include leading/trailing edge implementations - Add production-ready implementations with cancel/flush - Document Lodash usage and maxWait option - Provide 5 real-world examples (search, scroll, resize, etc.) - Cover requestAnimationFrame alternative - Add common mistakes section with fixes - Include 24 passing Vitest tests for all code examples - SEO optimized: 28/30 score with proper keywords
- Add complete concept page covering ES6 computed property names syntax - Include technical deep-dive on ToPropertyKey(), evaluation order, and type coercion - Cover Symbol keys comprehensively (iterator, toStringTag, toPrimitive, privacy patterns) - Document computed methods, getters/setters, and real-world use cases - Add edge cases section covering duplicate keys, __proto__ gotcha, and error handling - Create 41 comprehensive tests covering all code examples - Include 4 MDN references, 4 articles, and 4 video resources - SEO optimized: 3,449 words, 90% SEO score
…h tests - Replace placeholder with full Web Storage API documentation (~4000 words) - Cover localStorage vs sessionStorage differences with comparison table - Include JSON serialization patterns and gotchas - Document storage events for cross-tab communication - Add security considerations with OWASP reference - Provide decision flowchart for storage selection - Include common patterns: theme preference, form wizard, recently viewed - Add 79 comprehensive tests covering all code examples - Verify all external links (MDN, articles, videos)
- Complete IndexedDB documentation covering database operations, transactions, object stores, indexes, CRUD operations, cursors, and Promise wrappers - Add 22 tests covering utility functions and patterns - Include filing cabinet analogy with ASCII diagrams - Add storage comparison table (localStorage vs IndexedDB vs cookies) - Cover real-world patterns: sync queue, database helper class - Document common mistakes with fixes - SEO optimized with 93% score (28/30)
- Complete IndexedDB documentation covering database operations, transactions, object stores, indexes, CRUD operations, cursors, and Promise wrappers - Add 22 tests covering utility functions and patterns - Include filing cabinet analogy with ASCII diagrams - Add storage comparison table (localStorage vs IndexedDB vs cookies) - Cover real-world patterns: sync queue, database helper class - Document common mistakes with fixes - SEO optimized with 93% score (28/30)
- Complete event delegation documentation covering: - What is event delegation and how it works - event.target vs event.currentTarget differences - Element.matches() and Element.closest() usage - Handling dynamic/future elements automatically - Performance benefits of delegation pattern - Common patterns: action buttons, tabs, accordions - Limitations (non-bubbling events, stopPropagation) - Common mistakes and how to avoid them - Add 13 comprehensive tests covering all code examples - Include 4 MDN references, 4 articles, 3 video resources - SEO optimized with 30/30 score
- Complete 4,000+ word documentation covering Intersection Observer API - Cover lazy loading, infinite scroll, scroll animations, sticky headers - Include ASCII diagrams comparing scroll events vs IntersectionObserver - Add 37 tests (23 concept tests + 14 DOM tests) - Curate 10 quality resources (2 MDN, 4 articles, 4 videos) - Include Key Takeaways, Test Your Knowledge, and Common Mistakes sections
- Add complete Performance Observer API documentation covering: - Core Web Vitals measurement (LCP, CLS, INP, FCP, TTFB) - Resource, navigation, and paint timing - Long Tasks detection and custom marks/measures - Building Real User Monitoring (RUM) solutions - web-vitals library integration - Add 24 tests covering all code examples - Include Key Takeaways, Test Your Knowledge, and Related Concepts - Add curated MDN references, articles, and videos
- Add Beyond 33 tab with all 29 concept pages organized by category - Add What's Next section linking to Beyond 33 from main concepts - Add Beyond 33 overview page explaining the extended curriculum - Update scope-and-closures to link to hoisting deep dive - Update gitignore for project configuration
feat: add Beyond 33 JavaScript Concepts - Extended Learning Path
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