Simple example of nice, clean lens composition in ramda using a helper

lensCompositionFun.js

const nameLens = R.lensProp('name');

const user = {
  name: 'Joe',
  age: 34,
  isLoggedIn: true,
  address: {
    number: 123,
    street: 'best'
  }
};

const lensCreator = lens => transform => user => ({
  get: () => R.view(lens, user),
  set: (newName) => R.set(lens, newName, user),
  transform: () => R.over(lens, transform, user)
});

const transformAddress = input => `${input} street`;

const usersName = lensCreator(nameLens)(input => input.toLowerCase());
let currentUsersNameLens = usersName(user);
console.log('1: ' + currentUsersNameLens.get());
currentUsersNameLens = usersName(currentUsersNameLens.set('BoB'));
console.log('2: ' + currentUsersNameLens.get());
currentUsersNameLens = usersName(currentUsersNameLens.transform());
console.log('3: ' + currentUsersNameLens.get());

const addressLens = R.lensProp('address');
const streetLens = R.lensProp('street');

const usersStreetLens = R.compose(addressLens, streetLens);
const usersStreet = lensCreator(usersStreetLens)(transformAddress);

const newUsersStreet = usersStreet(user).transform();

console.log('addr: ', usersStreet(user).get());
console.log('new addr: ', usersStreet(newUsersStreet).get());