Question

Which is faster and/or less resources consuming:

class Foo()
{
    public int value;
}

This way?

public int doSomeStuff(Foo f)
{
    return (f.value + 1);
}

public int doOtherStuff()
{
    ...
    Foo f = new Foo();
    int x = doSomeStuff(f);
    ...
)

or this way?

public int doSomeStuff(int v)
{
    return (v + 1);
}

public int doOtherStuff()
{
    ...
    Foo f = new Foo();
    int x = doSomeStuff(f.value);
    ...
)

In both cases, "doSomeStuff" will not change nothing in foo class. It just needs to know the "value".

Answer 1

They both perform the same, the same sequence of operations occurs. Your main concern is maintainability and sensible design here. Think carefully about which methods need which data and design it properly.

If you do have issues, you can optimise later. But you should always optimise last.