A code sample from the article https://www.joshwulf.com/blog/2020/02/avoid-global-state/

update-member-with-throw.js

const GlobalMemberStore = (() => {
  let _members = []
  const Store = {
    updateMember: update => {
      const member = Store.getMember(update.id)
      if (!member.found) {
        throw new Error(`No member with id ${update.id} in the store!`)
      }
      _members = _members.map(m => m.id === update.id ? 
                                            {...update} : m)
    }
  }
  return Store
})()