In 1994, when I started my carrier, the state of computer languages was bad (IMO) and I imagined that one day I would create a new language. I had many ideas. Some of these ideas appeared in java (interfaces). I was very pleased to discovered that almost all my ideas were present in scala (the single exception is a fast compiler). It seems like a perfect language. I have tried to learn it, but failed. It takes too much time (I have 3 childs and a job). I gave up. Maybe it was caused by the complex collections system needed to support immutability. I will try again to learn it when I will have more time (??? ;-))