contact-mobx.js

import { observable } from 'mobx'

class ContactStore {
  @observable contacts = []
  
  load() {
    fetch(API_URL + '/contacts')
      .then(data => {
        const list = data.contacts.map(contactData => {
          return new Contact(contactData)
        })
        this.contacts.replace(list)
    })
  }
}