23 lines
460 B
Text
23 lines
460 B
Text
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collections define: #Stack &parents: {ExtensibleArray}.
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"An abstraction over ExtensibleArray implementations to follow the stack
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protocol. The convention is that the Sequence indices run least-to-greatest
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from bottom to top."
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s@(Stack traits) push: obj
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[s addLast: obj].
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s@(Stack traits) pop
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[s removeLast].
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s@(Stack traits) pop: n
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[s removeLast: n].
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s@(Stack traits) top
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[s last].
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s@(Stack traits) top: n
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[s last: n].
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s@(Stack traits) bottom
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[s first].
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