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String map performance improvement #9470

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Merged
cartermp merged 11 commits into from
Jun 27, 2020
Merged

String map performance improvement #9470

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9268073
Simplify and improve perf of String.length
abelbraaksma Jun 17, 2020
890ed1f
Improve performance of String.map
abelbraaksma Jun 17, 2020
10e5833
Revert "Simplify and improve perf of String.length"
abelbraaksma Jun 17, 2020
6c6b672
Resolves https://github.com/dotnet/fsharp/pull/9470#discussion_r44129…
abelbraaksma Jun 17, 2020
c054bb2
Lingering space
abelbraaksma Jun 17, 2020
e2cde1b
Change `String` to use `new` to clarify use of ctor
abelbraaksma Jun 17, 2020
b546153
Merge remote-tracking branch 'upstream/master' into String-map-perf
abelbraaksma Jun 17, 2020
332420e
Add some better tests for String.map, add side-effect test
abelbraaksma Jun 18, 2020
1b9bf85
Add tests to ensure the mapping function is called a deterministicall…
abelbraaksma Jun 18, 2020
0dd8922
Fix typo
abelbraaksma Jun 18, 2020
83ac13d
Remove "foo" from String.map tests
abelbraaksma Jun 19, 2020
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Revert "Simplify and improve perf of String.length"
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@abelbraaksma
abelbraaksma committed Jun 17, 2020
commit 10e583320f232435d10f5c986e91a431c722447a
6 changes: 4 additions & 2 deletions src/fsharp/FSharp.Core/string.fs
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Original file line number Diff line number Diff line change
Expand Up @@ -107,5 +107,7 @@ namespace Microsoft.FSharp.Core

[<CompiledName("Length")>]
let length (str:string) =
if isNull str then 0
else str.Length
if String.IsNullOrEmpty str then
0
else
str.Length