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!

----
peace,
sergio
photographer, journalist, visionary

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