Xah Ep746 JavaScript in depth. Compare nested array and object equality by content.

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 for this purpose (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).



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