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Module

x/rimbu/multimap/custom/index.ts>MultiMapEmpty#modifyAt

Rimbu is a TypeScript library focused on immutable, performant, and type-safe collections and other tools.
rimbu-org/rimbu
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method MultiMapEmpty.prototype.modifyAt
import { MultiMapEmpty } from "https://deno.land/x/rimbu@0.14.1/multimap/custom/index.ts";

Parameters

atKey: K
options: { ifNew?: OptLazy<StreamSource<V>>; }

Returns

WithKeyValue<Tp, K, V>["normal"]