Mida tähendab koopiapõhine ülekanne?

When passing by value to a function, a copy of the variable's value is passed, not a reference to the original. Changes made to the parameter inside the function do not affect the original variable outside.

In Swift, passing by copy is the default for structures and enumerations. For classes, passing by reference is used, but in this case, a copy of the reference itself is passed, not the object.

Example in Swift:

// Customer structure
struct Customer {
    var name: String
}

// Function that modifies a Customer parameter
func changeCustomerName(customer: Customer) {
    var modifiedCustomer = customer // A copy of the structure is created
    modifiedCustomer.name = "Jane"
    print("Inside function: \(modifiedCustomer.name)") // Output: Inside function: Jane
}

var myCustomer = Customer(name: "John")
print("Before function: \(myCustomer.name)") // Output: Before function: John

changeCustomerName(customer: myCustomer)

print("After function: \(myCustomer.name)") // Output: After function: John - the original value did not change

Key point: the function works with a local copy of the data.