@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.
17 lines (16 loc) • 556 B
JavaScript
// ets_tracing: off
import * as Tp from "../Collections/Immutable/Tuple/index.mjs";
import { getOrElse_ } from "../Option/index.mjs";
import { modify } from "./modify.mjs";
/**
* Atomically modifies the `FiberRef` with the specified partial function.
* If the function is undefined on the current value it returns the old value
* without changing it.
*/
export function updateSomeAndGet(f) {
return modify(v => {
const result = getOrElse_(f(v), () => v);
return Tp.tuple(result, result);
});
}
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