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Case Module Cookbook

In the following example, from an on-change hook or on-open, we can look up the corresponding participant for the current form, then look the age variable that has been previously set on that participant. 

const currentEventId = window.location.hash.split('/')[5]
const currentFormId = window.location.hash.split('/')[6]
const participantId = caseService
  .case
  .events
  .find(event => event.id === currentEventId)
  .eventForms
  .find(eventForm => eventForm.id === currentFormId)
  .participantId
const age = caseService.getParticipantData(participantId, 'age')