5posts
The native Set operations that shipped in modern engines — union, intersection, difference, symmetricDifference, isSubsetOf, isSupersetOf, isDisjointFrom — with before/after examples.
Why you used to need Array.from() before mapping/filtering an iterator, the new lazy iterator helper methods, and a practical example with an infinite generator.
A practical migration cheatsheet: how to do formatting, parsing, arithmetic, diffing, comparison, and time zone conversion in Temporal, mapped directly to the Moment/date-fns/Luxon/dayjs calls you already know.
The problem of forgetting to close a resource on an early exception, how Symbol.dispose/Symbol.asyncDispose work, and a practical example compared to try/finally.
What's wrong with the legacy Date object, how Temporal fixes it, the core types (PlainDate, ZonedDateTime, Duration...), and where support stands in 2026.