import { lensPath } from "https://deno.land/x/fae@v1.1.1/lensPath.ts";
Returns a lens whose focus is the specified path.
const xHeadYLens = Fae.lensPath(['x', 0, 'y'])
Fae.view(xHeadYLens, {x: [{y: 2, z: 3}, {y: 4, z: 5}]}) // {x: [{y: 1, z: 3}, {y: 4, z: 5}]}