The Next Exciting JavaScript Feature: Records & Tuples

on YouTube ↗24m

" summary

New primitives called Records & Tuples give value equality and deep immutability so two equal structures compare by contents, which fixes React re-render churn; change‑by‑copy adds toSorted/toReversed and with() so array nonmutating ops return new arrays; garbage‑collection needs a side table solved by Symbols as WeakMap keys (not in browsers yet); a Babel plugin transpiles syntax for experiments and Safari 16 already ships change‑by‑copy.

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" chapters (13)

1. 0:00Records and Tuples intro
2. 0:51Immutable state problems
3. 3:52Immutable libraries limits
4. 6:09What are Records & Tuples
5. 8:50Records vs Tuples comparison
6. 10:00Updating Records & Tuples
7. 11:43Change Array by Copy
8. 13:35Referencing objects in R&T
9. 16:29Garbage collection & WeakMaps
10. 19:24Symbols as WeakMap keys
11. 19:48Status and polyfills
12. 22:26Testing & production use
13. 22:51Q&A

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