Example of turning a procedural-style code into a more functional one.

refactor-procedural-into-functional.js

// Procedural
const getPhoneAreaAndNumber = ({ whatsappPhone, cellPhone, homePhone }) => {
  if (whatsappPhone && isCellPhone(whatsappPhone)) return { area: getPhoneArea(whatsappPhone), number: getPhoneNumber(whatsappPhone) }
  if (cellPhone && isCellPhone(cellPhone)) return { area: getPhoneArea(cellPhone), number: getPhoneNumber(cellPhone) }
  if (homePhone && isCellPhone(homePhone)) return { area: getPhoneArea(homePhone), number: getPhoneNumber(homePhone) }
  return { area: '', number: '' }
}

// We can turn the above into this:

// Functional
const getPhoneAreaAndNumber = ({ whatsappPhone, cellPhone, homePhone }) => pipe(
  find(isCellPhone),
  formatters.phone.format,
)([whatsappPhone, cellPhone, homePhone])

// Cool, huh‽