fp-js-7_benefits-1.js

// A version with explicit references to arguments
const getLastUserDisplayName = () => {
  return getAllUsers()
    .then(users => R.last(users))
    .then(lastUser => lastUser.firstName)
    .then(firstName => R.toUpper)
}

// A point-free equivalent
const getLastUserDisplayName = () => {
  return getAllUsers()
    .then(R.last)
    .then(R.prop('firstName'))
    .then(R.toUpper)
}