当只返回空值时，如何选择make the default value of all variable '0‘？

def my_function():
    result = some_operation()
    if result is None:
        result = 0
    return result

function myFunction() {
    var result = someOperation() || 0;
    return result;
}

public int myFunction() {
    return myFunction(0);
}

public int myFunction(int value) {
    return someOperation() != null ? someOperation() : value;
}

public class MyClass {
    private int myVariable;

    public MyClass() {
        myVariable = 0;
    }

    // Other methods and properties...
}