A fixed-sized LIFO.
A fixed size LIFO data structure, optionally free of duplicates. They feel a lot like arrays, but differ in some important areas like indexing. This is e.g. useful for keeping a history of recent actions.
Create a new
r = Revolver.new(3) #=> #<Revolver: >
Revolver with unique elements:
r = Revolver.new(3, true) #=> #<Revolver: >
Alternatively, you can create a
Revolver from an existing array:
Revolver.from_array([*1..3], 3) #=> #<Revolver: [1, 2, 3]>
Or from a list of elements:
Revolver[*1..3] #=> #<Revolver: [1, 2, 3]>
You can also create a unique
Revolver that way:
Revolver.from_array([1, 1, 3], true) #=> #<Revolver: [1, 3]>
r = Revolver.new(3).push(1).push(2).push(3) #=> #<Revolver: [1, 2, 3]> r.push(4) #=> #<Revolver: [2, 3, 4]> r << 5 << 6 #=> #<Revolver: [4, 5, 6]>
Remove an element from the end:
r.pop #=> 6
r.size #=> 2
Revolver can be indexed like an array:
r = Revolver.from_array([*1..5]) #=> #<Revolver: [1, 2, 3, 4, 5]> r #=> 5
However, indices wrap around:
r #=> 1
This also works for negative indices:
r[-1] #=> 5 r[-6] #=> 1 r[-8] #=> 3
Finally you can get a plain array out of a
r.to_a #=> [1, 2, 3, 4, 5]
Copyright (c) 2012 Michael Kohl
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