@effect-ts/system
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Effect-TS is a zero dependency set of libraries to write highly productive, purely functional TypeScript at scale.
12 lines (11 loc) • 490 B
JavaScript
// ets_tracing: off
import * as Tp from "../Collections/Immutable/Tuple/index.mjs";
import * as O from "../Option/index.mjs";
import { modify } from "./modify.mjs";
/**
* Atomically modifies the `FiberRef` with the specified partial function and
* returns the old value.
* If the function is undefined on the current value it doesn't change it.
*/
export const getAndUpdateSome = f => modify(v => Tp.tuple(v, O.getOrElse_(f(v), () => v)));
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