yuck.md

Refactor this

Spec

when on the server
  return ''
when on the client
  when gclid=12345 GET param is present in the URL
    store it in sessionStorage
    return '12345'
  when gclid GET param is not present in the URL
    when sessionStorage is not supported
      return ''
    when sessionStorage is supported
      when gclid=12345 is set in sessionStorage
        return '12345'
      when gclid is not set in sessionStorage
        return ''

Current Implementation 👎

I bet something nice can be done with arrays of functions and find, filter, and forEach 🤷‍♂️

function getGoogleClickId() {
  if (typeof document === 'undefined') {
    return ''
  }
  const fromUrl = new URLSearchParams(document.location.search).get('gclid')
  if (fromUrl) {
    if (typeof sessionStorage !== 'undefined') {
      sessionStorage.setItem('gclid', fromUrl)
    }
    return fromUrl
  }
  if (typeof sessionStorage !== 'undefined') {
    return sessionStorage.getItem('gclid') || ''
  }
  return ''
}