Get an array of property values from an object array

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You can use the map method, which transform an array of a certain type to an array of another type – in your case, from array of Employee to array of Int:

var array = [Employee]()
array.append(Employee(id: 4, firstName: "", lastName: ""))
array.append(Employee(id: 2, firstName: "", lastName: ""))

let ids = array.map { $0.id }

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