Xah Talk Show 2026-01-19 Ep746 JavaScript in depth. Compare array and object equality
Video Summary (Generated by AI, Edited by Human.)
intro. About comparing arrays and objects by their content in JavaScript (0:15).
JavaScript built-in equal operator compare references, not content (0:24). Intro an isObjectEqual function (0:41). Claims it is the most efficient and correct (5:48). This recursive function compares enumerable properties and handles nested arrays and objects (4:31).
Discusses alternative approach using JSON.stringify to convert arrays/objects to strings for comparison (1:10). However, the speaker highlights several problems with this method, including:
- Object key order problem (1:41, 39:27).
- undefined and null values problem. (1:51, 40:21).
- Sparse arrays problem. (1:51, 41:12).
- Several digressions.
- "ultimate hacking keyboard" (2:37).
- importance of large fonts for live streams (3:48).
- explain and demo Deno auto-formatter (16:21), and on the history and implications of trailing commas in JavaScript and other programming languages (21:50, 32:02).
- The decline of jQuery's relevance since 2015 (48:02) and touches upon asynchronous JavaScript and Node.js (49:03).
- about writing benchmark using deno. (20:48, 33:19).
- into JavaScript tutorial for further details (44:18).
- trailing comma vs repeated comma
- programing language design, thinking, history of trailing comma
- which prog lang allow trailing comma in list or array items
- https://x.com/i/grok/share/573a7669989545d2b64a69a0a368b130
console.assert- on jquery
- JS: Test Equality of Array and Object by Content 📜
- JS: Test Array Equality as JSON String 🐞
- JS: Test Object Equality by JSON String, Ordering Problem
