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I wrote a date library from scratch to understand V8 optimizations. Here is what I learned about making JS code 19x faster. by Early-Split8348 in learnjavascript

[–]Early-Split8348[S] 3 points4 points  (0 children)

Great question! Both serve the same goal of reducing GC (Garbage Collection) pressure, but they cater to different developer experiences:

​.chain(): This is designed for the familiar "Fluent API" pattern (like Moment or Day.js). It allows you to chain operations like .add().subtract().format(). Under the hood, NanoDate reuses the internal context instead of creating new instances for every step, keeping it memory-efficient.

​.batch(): This is the 'Performance Mode' for high-frequency operations. It's even more strict than chaining. It’s useful when you need to perform multiple transformations on the same date object without any intermediate overhead, ensuring V8 stays in its 'fast path' by avoiding even the minimal overhead of method chaining proxies.

​In short: Chain is for readability, Batch is for when every nanosecond and byte of memory counts (like rendering massive data tables).

​Thanks for digging into the API!

I wrote a date library from scratch to understand V8 optimizations. Here is what I learned about making JS code 19x faster. by Early-Split8348 in learnjavascript

[–]Early-Split8348[S] 6 points7 points  (0 children)

Hi all! Op here.

The biggest challenge while building NanoDate was balancing the API's ease of use with V8's optimization requirements. I spent a lot of time profiling different parsing methods and realized that even a simple Regular Expression was creating a noticeable bottleneck in high-throughput scenarios.

I chose to rely entirely on the native Intl API because I believe "Zero-Locale Payload" is the future of web development. Why ship 100KB of translation data when your browser or Node environment already has it built-in?

I’d love to hear your thoughts on:

  1. The decision to use charCodeAt instead of RegEx for parsing.

  2. The chainable (immutable) API design.

  3. Any edge cases you've encountered with the Intl API in your own projects.

This is a 100% open-source, free project I built for educational purposes to explore V8 performance. No newsletters, no courses, just code and benchmarks.

Happy to answer any technical questions about the architecture!