import { over } from "https://deno.land/x/fae@v1.1.1/over.ts";
Returns the result of "setting" the portion of the given data structure target
focused by the given lens to the result of applying the given function fn to
the focused value.
const headLens = Fae.lensIndex(0)
Fae.over(headLens, (x: string) => x.toUpperCase(), ['foo', 'bar', 'baz']) // ['FOO', 'bar', 'baz']