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Module

x/fun/mod.ts>decoder.contramap

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 decoder.contramap
import { decoder } from "https://deno.land/x/fun@v2.0.0-alpha.6/mod.ts";
const { contramap } = decoder;

Parameters

fld: (l: L) => D

Returns

<A>(ua: Decoder<D, A>) => Decoder<L, A>