#3002: Documentation for Data.Map.unionWithKey makes reference to "new" and
"old"
values which have no meaning in a union.
-----------------------------+----------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Component: libraries (other)
Version: 6.10.1 | Severity: trivial
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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The example given for unionWithKey uses rather odd names "new_value" and
"old_value" for the values in the two maps. Perhaps more appropriate
names would be leftValue and rightValue. This has been commented on in
#haskell that where the values come from is not clear.
let f key new_value old_value = (show key) ++ ":" ++ new_value ++ "|" ++
old_value
unionWithKey f (fromList [(5, "a"), (3, "b")]) (fromList [(5, "A"), (7,
"C")]) == fromList [(3, "b"), (5, "5:a|A"), (7, "C")]
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3002>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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