The whole future declared in a var
summary
Claim: specify every future value of a variable at its declaration and have the system propagate updates automatically. Demonstrates RxJS observables and operators like map, scan and filter, showing a stream a with events 3 4 6 mapped to b = 10a producing 30 40 60, and counting clicks with fromEvent + scan. Compares spreadsheets, notes observables are a stage‑one ECMAScript proposal, and uses a slides stream to prove separation of concerns* and immutable declared futures.
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