What does this line of code mean exactly?

[Disastercake]

I found this line of code in the Set Position event.

positionChange = space == Space.World ? go.transform.position : go.transform.localPosition;

I'm unfamiliar with this "==" and ":" and "?" syntax.  Would someone mind explaining this to me?

[Alex Chouls]

It's a more compact way of saying:

if (space == Space.world)
{
   positionChange = go.transform.position;
}
else
{
   positionChange = go.transform.localPosition;
}