lens.js

const replace = func => obj => obj.replace(func)
const map = func => obj => obj.map(func)
const getProp = prop => obj => obj.get(prop)
const allStreets = compose(map(getProp('street')), getProp('addresses'))


const updateUser = user => 
  allStreets(user)
  .map(replace(/\d+/, '****'))

const profilePage = x => x.map(y => `<span>${y}<span>`)

const renderProfile = compose(profilePage, updateUser, getUser)