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indexBy, which indexes a collection into a hashtable

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Simon Hafner 2014-02-06 16:11:55 -06:00
commit 5498415f3b
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10
lib/pure/collections/tables.nim
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@ -189,6 +189,16 @@ template dollarImpl(): stmt {.dirty.} =
proc `$`*[A, B](t: TTable[A, B]): string =
## The `$` operator for hash tables.
dollarImpl()
proc `==`*[A, B](s, t: TTable[A, B]): bool =
s.counter == t.counter and s.data == t.data
proc indexBy*[A, B, C](collection: A, index: proc(x: B): C): TTable[C, B] =
## Index the collection with the proc provided.
# TODO: As soon as supported, change collection: A to collection: A[B]
result = initTable[C, B]()
for item in collection:
result[index(item)] = item
# ------------------------------ ordered table ------------------------------