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delete user.firstName
console.log(user.firstName) //undefined
console.log(Object.keys(user) // [ 'lastName', 'fullname' ]
// But if we set a property to 'undefined', the property still exits and the object still contains its key.
user.firstName = undefined
console.log(Object.keys(user)) // [ 'lastName', 'fullname', 'firstName' ]
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