What is structuredClone in JavaScript?

Native deep clone for objects, preserving Dates, Maps, Sets, undefined. Beats JSON hacks.

How does Object.groupBy work?

Groups arrays by key function into object of arrays. Like lodash.groupBy, but built-in.

Does Array.at support negative indexes?

Yes — at(-1) grabs last item, strings too. No more length-1 hacks.

AbortController vs flags?

Flags lie; AbortController cancels fetches for real, perfect for debouncing.

💻 Programming Languages

Why You're Still Writing Crappy JavaScript in 2024 — And How Built-ins Fix It

Still copying objects with JSON.parse/stringify? That's not just lazy — it's a bug factory. Time to use JavaScript's overlooked built-ins before your bundle chokes.

theAIcatchup Apr 10, 2026 4 min read

Code comparison: old Lodash hacks vs modern JavaScript built-in APIs like structuredClone and Object.groupBy

⚡ Key Takeaways

Swap JSON clones for structuredClone to avoid Date/Map bugs. 𝕏
Object.groupBy replaces verbose reduces — cleaner grouping. 𝕏
AbortController kills rogue fetches; Array.at simplifies indexing. 𝕏

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theAIcatchup

Community-driven. Code-first.

#AbortController #JavaScript APIs #Object.groupBy #javascript #modern APIs #modern JavaScript APIs #structuredClone

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Originally reported by Dev.to

⚡ Key Takeaways

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