Blake wrote:
Here's another one:I've created a method that returns an array of its own class: anArray: aQuantity | a | a := Array new: aQuantity. a size do: [:i | a at: i put: self class new]. ^ a but, for a while, I was trying to make this a single line: ^ (Array new: aQuantity) do: [:item | item := stuff ]
Here, you're constantly assigning the variable "item" to new values, so the array remains untouched. I guess in a perfect world, the compiler shouldn't allow assignment to block parameters... I'm surprised that the Squeak compiler allows this.
Also, observing that "at:" is actually implemented in Object, which seems...odd!
It is a bit odd. An Object in the virtual machine resembles an array of instance variables, and that method assigns to an instance variable by number. It's not often useful (and downright dangerous if you ask me), but I've used it before (for example) to serialize the state of any object in an image.
Michael. _______________________________________________ Beginners mailing list [email protected] http://lists.squeakfoundation.org/mailman/listinfo/beginners
