New python beginner tends to do this

1
2
3
4

a = []
a.append(1)
a.append(2)
a.append(3)

It is not a mistake per-se, but definitely a very clumsy style.

1

a = [1, 2, 3]

Base class stream API

The more I know about about oCaml, the more interesting it appears to me.

The inferred static type system is really interesting. It is clearly ahead of many other languages.The only other language I know that has similar feature is Scala.

http://en.wikipedia.org/wiki/Algebraic_data_type

Algebraic data type is a kind of composite type, i.e. a type formed by combining other types. Two common classes of algebraic type are product types and sum types

I was playing with a

http://www.mobisoftinfotech.com/blog/iphone/ios-tutorial-custom-speedometer-control/

It turned out I added a control ‘test’, linked it to an IBOutlet and then removed the control. Since the link to IBOutlet is sTILl in the IB file, hence the error.

By right mouse click on the ‘Owner’ and remove the invalid link, it fixes the problem.