Null Typ danych w JavaScript

let contact = {
    firstName: 'John',
    lastName: 'Doe',
    email: '[email protected]',
    phone: '(408)-555-9999',
    address: {
        building: '4000',
        street: 'North 1st street',
        city: 'San Jose',
        state: 'CA',
        country: 'USA'
    }
}
Code language: JavaScript (javascript)
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