import { OptionAbstract } from "https://deno.land/x/careful@v0.1.0/mod.ts";
Parameters
cb: (v: T) => Promise<OptionAbstract<NT>>
Returns
Promise<OptionAbstract<T> | OptionAbstract<NT>>
import { OptionAbstract } from "https://deno.land/x/careful@v0.1.0/mod.ts";