The Swim Collections library implements immutable, structure sharing collections, including B-trees and S-trees (sequence trees).
The BTree
class implements the OrderedMap
interface from @swim/util,
and compares keys using Objects.compare
, also from @swim/util. BTree
is internally immutable, enabling lightweight snapshotting via BTree.clone
,
and non-destructive mutation via BTree.updated
, and BTree.removed
.
BTree
also implements the ReducedMap
interface from @swim/util,
providing storage of sub-tree reductions in b-tree nodes to support log
time recomputation of whole tree reductions after incremental updates.
The STree
class implements a sequential list data type that's backed by an
implicitly indexed b-tree. Like BTree
, STree
supports lightweight
snapshotting via STree.clone
.
STree
associated a unique ID with each list item, which can be used to
reconcile concurrent, conflicting updates to the same logical list.
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