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Define an unmodifiable empty map

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python 2.6
import collections
EmptyDict = collections.namedtuple("EmptyDict", "")
e = EmptyDict()
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clojure
; Clojure maps are immutable
(def m {})
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fsharp
// Most native fsharp data structures are immutable - updating a 'map' sees a modified copy created
let map = Map.empty
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fantom
map := [:].ro
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java
Map empty = Collections.EMPTY_MAP;
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java org.apache.commons
SortedMap empty = MapUtils.EMPTY_SORTED_MAP;

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