[Rails] Koans question : Don't understand the answers

On Wednesday, September 19, 2012 at 1:23 AM, roelof wrote:

Hello,

Im trying to learn ruby by using koans.

Now I have to fill in this part.

def test_some_system_objects_always_have_the_same_id
assert_equal --, false.object_id
assert_equal --, true.object_id
assert_equal --, nil.object_id
end

According to the answers I have to fill in like this :

def test_some_system_objects_always_have_the_same_id
assert_equal 0, false.object_id
assert_equal 2, true.object_id
assert_equal 4, nil.object_id
end

But how can I normally know the id of a object ?

Roelof

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