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Module

x/fun/mod.ts>sync_either.mapLeft

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

Parameters

fbj: (b: B) => J

Returns

<A>(ta: SyncEither<B, A>) => SyncEither<J, A>