Doubly-linked list/Traversal: Difference between revisions
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say $dll.reverse;</lang> |
say $dll.reverse;</lang> |
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These automatically return just the payloads, hiding the elements containing the forward and backward pointers. |
These automatically return just the payloads, hiding the elements containing the forward and backward pointers. |
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=={{header|Phix}}== |
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<lang Phix>enum NEXT,PREV,DATA |
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constant empty_dll = {{1,1}} |
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sequence dll = empty_dll |
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procedure insert_after(object data, integer pos=1) |
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integer prv = dll[pos][PREV] |
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dll = append(dll,{pos,prv,data}) |
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if prv!=0 then |
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dll[prv][NEXT] = length(dll) |
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end if |
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dll[pos][PREV] = length(dll) |
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end procedure |
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insert_after("ONE") |
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insert_after("TWO") |
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insert_after("THREE") |
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?dll |
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procedure show(integer d) |
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integer idx = dll[1][d] |
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while idx!=1 do |
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?dll[idx][DATA] |
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idx = dll[idx][d] |
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end while |
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end procedure |
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show(NEXT) |
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?"==" |
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show(PREV)</lang> |
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{{out}} |
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<pre> |
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{{2,4},{3,1,"ONE"},{4,2,"TWO"},{1,3,"THREE"}} |
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"ONE" |
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"TWO" |
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"THREE" |
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"==" |
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"THREE" |
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"TWO" |
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"ONE" |
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</pre> |
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=={{header|PicoLisp}}== |
=={{header|PicoLisp}}== |
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