mergeObjects.js

const persons =[{
  id: 'aBcDeFgH',
  firstName: 'Juan',
  lastName: 'Doe',
  age: 32
},
{
  id: 'zYxWvUt',
  firstName: 'Alex',
  lastName: 'Smith',
  age: 24
}]

const info = [{
  id: 'aBcDeFgH',
  occupation: 'architect',
  address: {
    street: '123 Main St',
    city: 'CityTown',
    Country: 'USA'
  }
},
{
  id: 'zYxWvUt',
  occupation: 'receptionist',
  address: {
    street: '555 Ocean Ave',
    city: 'Beach City',
    Country: 'USA'
  }
}]
const mergeDataStreams = ()=>{
    let retValue = []
    persons.forEach((person)=>{
        console.log(`finding info for: ${person.firstName} ${person.lastName}`)
        const personInfo = info.find(item=>item.id===person.id)
        const mergedInfo = Object.assign({}, person, personInfo)
        //const mergedInfo = {...person, ...personInfo}
        retValue.push(mergedInfo)
    })
    return retValue
}