const arr1 = [
{
'email': 'email@email1',
'name': 'name1'
},
{
'email': 'email@email2',
'name': 'name2'
}
]
const arr2 = [
{
'email': 'email@email1',
'date': 2021
},
{
'email': 'email@email3',
date: 2020
}
]