Iterate a collection backwards in Pharo Smalltalk

Question

I'm new using Pharo and I'm trying to iterate over an OrderedCollection, but starting from the end.

For example:

| c |
c := OrderedCollection new.
c add: (1).
c add: (2).
c add: (3).
c do: [ :each | Transcript show: each ; cr ]

The result is 1 2 3 but I want 3 2 1.

Is it possible or do I have to use another kind of collection?

You can also use `Transcript logCr: each`, and when inside a method `self logCr: each` — Peter Uhnak, Jan 07 '16 at 22:23

score 17 · Accepted Answer · edited Jul 16 '19 at 20:46

17

To iterate an OrderedCollection in reverse order you can use the reverseDo: method, e.g.

c reverseDo: [ :each | Transcript show: each; cr ].

edited Jul 16 '19 at 20:46

halfer

answered Jan 07 '16 at 21:27

1 Answers1