docs(computed-property-names): add comprehensive concept page with tests

- 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

Leonardo Maldonado committed on Jan 6, 2026, 09:22 PM

Showing 2 changed files +1638 additions -0 deletions

A docs/beyond/concepts/computed-property-names.mdx +952

A tests/beyond/modern-syntax-operators/computed-property-names/computed-property-names.test.js +686