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Module

x/fun/map.ts>modify

A collection of algebraic data types, lenses, and schemables based on a light weight higher kinded type implementation. Written for deno.
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function modify
import { modify } from "https://deno.land/x/fun@v2.0.0-alpha.10/map.ts";

Returns

<A>(modifyFn: (a: A) => A) => (key: B) => (ta: ReadonlyMap<B, A>) => ReadonlyMap<B, A>