Also, you���re not setting the instance variable - just returning an OrderedCollection - is that what you want to do?

e.g. setting the trees instance variable:

trees
^ trees ifNil: [ trees := OrderedCollection new ]

like Bernardo said, when you call #trees from within the #trees method (with self trees) - like in your first example, you created an infinite loop.

On 11 Mar 2017, at 3:36 pm, Bernardo Ezequiel Contreras <vonbecmann@gmail.com> wrote:

i think that in the first case you access an instance variable trees while in the second case you send a message trees to self that cause an infinite recursion.
am i right?


On Sat, Mar 11, 2017 at 12:57 AM, sergio ruiz <sergio.rrd@gmail.com> wrote:
I have a simple one, but i need to understand what is going on..

i have something like

Tree

with a class method

trees
^ trees ifNil: [OrderedCollection new]

i initially ran into trouble with it locking my image up because i wrote it as:

trees
^ self trees ifNil: [OrderedCollection new]

what is the semantic difference between these two calls?

THanks!

 




--
Bernardo E.C.

Sent from a cheap desktop computer in South America.