lenses.js

import { lensPath, lensProp, compose } from 'ramda';

const objectsLens = lensPath(['scene', 'structure', 'objects']);
const groupsLens = lensPath(['scene', 'structure', 'groups']);

// If you use lenses all over the place, you may have some laying around allready, like these
const sceneLens = lensProp('scene');
const structureLens = lensProp('structure');
const objectsLens = lensProp('objects');
const groupsLens = lensProp('groups');

// If so, we could make those top ones even easier
const structureObjectLens = compose(sceneLens, structureLens, objectsLens);
const structureGroupLens = compose(sceneLens, structureLens, groupsLens);