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Tuple<T1,T2,T3> F# snippets (#7944)
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‎snippets/fsharp/System/TupleT1,T2,T3/Equals/equals1.fs‎

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module equals1
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// <Snippet1>
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open System
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let scores =
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[| Tuple.Create("Ed", 78.8, 8)
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Tuple.Create("Abbey", 92.1, 9)
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Tuple.Create("Ed", 71.2, 9)
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Tuple.Create("Sam", 91.7, 8)
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Tuple.Create("Ed", 71.2, 5)
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Tuple.Create("Penelope", 82.9, 8)
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Tuple.Create("Ed", 71.2, 9)
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Tuple.Create("Judith", 84.3, 9) |]
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// Test each tuple object for equality with every other tuple.
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for ctr = 0 to scores.Length - 1 do
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let currentTuple = scores[ctr]
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for ctr2 = ctr + 1 to scores.Length - 1 do
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printfn $"{currentTuple} = {scores[ctr2]}: {currentTuple.Equals scores[ctr2]}"
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printfn ""
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// The example displays the following output
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// (Ed, 78.8, 8) = (Abbey, 92.1, 9): False
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// (Ed, 78.8, 8) = (Ed, 71.2, 9): False
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// (Ed, 78.8, 8) = (Sam, 91.7, 8): False
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// (Ed, 78.8, 8) = (Ed, 71.2, 5): False
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// (Ed, 78.8, 8) = (Penelope, 82.9, 8): False
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// (Ed, 78.8, 8) = (Ed, 71.2, 9): False
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// (Ed, 78.8, 8) = (Judith, 84.3, 9): False
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//
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// (Abbey, 92.1, 9) = (Ed, 71.2, 9): False
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// (Abbey, 92.1, 9) = (Sam, 91.7, 8): False
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// (Abbey, 92.1, 9) = (Ed, 71.2, 5): False
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// (Abbey, 92.1, 9) = (Penelope, 82.9, 8): False
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// (Abbey, 92.1, 9) = (Ed, 71.2, 9): False
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// (Abbey, 92.1, 9) = (Judith, 84.3, 9): False
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//
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// (Ed, 71.2, 9) = (Sam, 91.7, 8): False
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// (Ed, 71.2, 9) = (Ed, 71.2, 5): False
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// (Ed, 71.2, 9) = (Penelope, 82.9, 8): False
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// (Ed, 71.2, 9) = (Ed, 71.2, 9): True
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// (Ed, 71.2, 9) = (Judith, 84.3, 9): False
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//
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// (Sam, 91.7, 8) = (Ed, 71.2, 5): False
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// (Sam, 91.7, 8) = (Penelope, 82.9, 8): False
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// (Sam, 91.7, 8) = (Ed, 71.2, 9): False
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// (Sam, 91.7, 8) = (Judith, 84.3, 9): False
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//
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// (Ed, 71.2, 5) = (Penelope, 82.9, 8): False
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// (Ed, 71.2, 5) = (Ed, 71.2, 9): False
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// (Ed, 71.2, 5) = (Judith, 84.3, 9): False
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//
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// (Penelope, 82.9, 8) = (Ed, 71.2, 9): False
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// (Penelope, 82.9, 8) = (Judith, 84.3, 9): False
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//
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// (Ed, 71.2, 9) = (Judith, 84.3, 9): False
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// </Snippet1>

‎snippets/fsharp/System/TupleT1,T2,T3/Equals/equals2.fs‎

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module equals2
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// <Snippet2>
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open System
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open System.Collections
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type Item2Comparer<'T1, 'T2, 'T3 when 'T1: equality and 'T2: equality and 'T3: equality>() =
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interface IEqualityComparer with
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member _.Equals(x: obj, y: obj) =
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// Return true for all values of Item1.
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match x with
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| :? 'T1 ->
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true
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| :? 'T2 ->
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x.Equals y
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| _ -> true
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member _.GetHashCode(obj: obj) =
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match obj with
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| :? 'T1 as obj->
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obj.GetHashCode()
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| :? 'T2 as obj ->
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obj.GetHashCode()
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| _ ->
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(obj :?> 'T3).GetHashCode()
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let scores =
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[| Tuple.Create("Ed", 78.8, 8)
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Tuple.Create("Abbey", 92.1, 9)
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Tuple.Create("Jim", 71.2, 9)
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Tuple.Create("Sam", 91.7, 8)
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Tuple.Create("Sandy", 71.2, 5)
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Tuple.Create("Penelope", 82.9, 8)
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Tuple.Create("Serena", 71.2, 9)
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Tuple.Create("Judith", 84.3, 9) |]
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for ctr = 0 to scores.Length - 1 do
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let score : IStructuralEquatable = scores[ctr]
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for ctr2 = ctr + 1 to scores.Length - 1 do
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printfn $"{score} = {scores[ctr2]}: {score.Equals(scores[ctr2], Item2Comparer<string, double, int>())}"
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printfn ""
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// The example displays the following output:
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// (Ed, 78.8, 8) = (Abbey, 92.1, 9): False
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// (Ed, 78.8, 8) = (Jim, 71.2, 9): False
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// (Ed, 78.8, 8) = (Sam, 91.7, 8): False
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// (Ed, 78.8, 8) = (Sandy, 71.2, 5): False
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// (Ed, 78.8, 8) = (Penelope, 82.9, 8): False
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// (Ed, 78.8, 8) = (Serena, 71.2, 9): False
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// (Ed, 78.8, 8) = (Judith, 84.3, 9): False
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//
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// (Abbey, 92.1, 9) = (Jim, 71.2, 9): False
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// (Abbey, 92.1, 9) = (Sam, 91.7, 8): False
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// (Abbey, 92.1, 9) = (Sandy, 71.2, 5): False
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// (Abbey, 92.1, 9) = (Penelope, 82.9, 8): False
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// (Abbey, 92.1, 9) = (Serena, 71.2, 9): False
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// (Abbey, 92.1, 9) = (Judith, 84.3, 9): False
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//
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// (Jim, 71.2, 9) = (Sam, 91.7, 8): False
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// (Jim, 71.2, 9) = (Sandy, 71.2, 5): True
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// (Jim, 71.2, 9) = (Penelope, 82.9, 8): False
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// (Jim, 71.2, 9) = (Serena, 71.2, 9): True
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// (Jim, 71.2, 9) = (Judith, 84.3, 9): False
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//
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// (Sam, 91.7, 8) = (Sandy, 71.2, 5): False
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// (Sam, 91.7, 8) = (Penelope, 82.9, 8): False
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// (Sam, 91.7, 8) = (Serena, 71.2, 9): False
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// (Sam, 91.7, 8) = (Judith, 84.3, 9): False
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//
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// (Sandy, 71.2, 5) = (Penelope, 82.9, 8): False
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// (Sandy, 71.2, 5) = (Serena, 71.2, 9): True
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// (Sandy, 71.2, 5) = (Judith, 84.3, 9): False
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//
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// (Penelope, 82.9, 8) = (Serena, 71.2, 9): False
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// (Penelope, 82.9, 8) = (Judith, 84.3, 9): False
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//
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// (Serena, 71.2, 9) = (Judith, 84.3, 9): False
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// </Snippet2>

‎snippets/fsharp/System/TupleT1,T2,T3/Equals/fs.fsproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net6.0</TargetFramework>
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</PropertyGroup>
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<ItemGroup>
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<Compile Include="equals1.fs" />
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<Compile Include="equals2.fs" />
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</ItemGroup>
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</Project>

‎snippets/fsharp/System/TupleT1,T2,T3/Overview/example1.fs‎

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// <Snippet1>
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open System
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let computeStatistics (scores: Tuple<string, double, int>[]) =
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let mutable n = 0
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let mutable sum = 0.
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// Compute the mean.
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for score in scores do
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n <- n + score.Item3
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sum <- sum + score.Item2 * double score.Item3
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let mean = sum / double n
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// Compute the standard deviation.
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let mutable ss = 0.
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for score in scores do
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ss <- (score.Item2 - mean) ** 2.
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let sd = sqrt (ss / double scores.Length)
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Tuple.Create(scores.Length, mean, sd)
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let scores =
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[| Tuple.Create("Jack", 78.8, 8)
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Tuple.Create("Abbey", 92.1, 9)
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Tuple.Create("Dave", 88.3, 9)
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Tuple.Create("Sam", 91.7, 8)
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Tuple.Create("Ed", 71.2, 5)
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Tuple.Create("Penelope", 82.9, 8)
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Tuple.Create("Linda", 99.0, 9)
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Tuple.Create("Judith", 84.3, 9) |]
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let result = computeStatistics scores
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printfn $"Mean score: {result.Item2:N2} (SD={result.Item3:N2}) (n={result.Item1})"
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// The example displays the following output:
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// Mean score: 87.02 (SD=0.96) (n=8)
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// </Snippet1>

‎snippets/fsharp/System/TupleT1,T2,T3/Overview/fs.fsproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net6.0</TargetFramework>
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</PropertyGroup>
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<ItemGroup>
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<Compile Include="example1.fs" />
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</ItemGroup>
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</Project>

‎snippets/fsharp/System/TupleT1,T2,T3/System.Collections.IStructuralComparable.CompareTo/compareto1.fs‎

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module compareto1
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// <Snippet1>
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open System
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let scores =
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[| Tuple.Create("Jack", 78.8, 8)
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Tuple.Create("Abbey", 92.1, 9)
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Tuple.Create("Dave", 88.3, 9)
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Tuple.Create("Sam", 91.7, 8)
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Tuple.Create("Ed", 71.2, 5)
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Tuple.Create("Penelope", 82.9, 8)
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Tuple.Create("Linda", 99.0, 9)
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Tuple.Create("Judith", 84.3, 9) |]
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printfn "The values in unsorted order:"
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for score in scores do
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printfn $"{score}"
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printfn ""
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Array.Sort scores
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printfn "The values in sorted order"
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for score in scores do
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printfn $"{score}"
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// The example displays the following output
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// The values in unsorted order:
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// (Jack, 78.8, 8)
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// (Abbey, 92.1, 9)
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// (Dave, 88.3, 9)
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// (Sam, 91.7, 8)
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// (Ed, 71.2, 5)
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// (Penelope, 82.9, 8)
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// (Linda, 99, 9)
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// (Judith, 84.3, 9)
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//
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// The values in sorted order:
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// (Abbey, 92.1, 9)
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// (Dave, 88.3, 9)
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// (Ed, 71.2, 5)
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// (Jack, 78.8, 8)
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// (Judith, 84.3, 9)
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// (Linda, 99, 9)
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// (Penelope, 82.9, 8)
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// (Sam, 91.7, 8)
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// </Snippet1>

‎snippets/fsharp/System/TupleT1,T2,T3/System.Collections.IStructuralComparable.CompareTo/compareto2.fs‎

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module compareto2
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// <Snippet2>
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open System
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open System.Collections
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open System.Collections.Generic
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type ScoreComparer<'T1, 'T2, 'T3>() =
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interface IComparer with
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member _.Compare(x: obj, y: obj) =
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match x with
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| :? Tuple<'T1, 'T2, 'T3> as tX ->
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let tY = y :?> Tuple<'T1, 'T2, 'T3>
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Comparer<'T2>.Default.Compare(tX.Item2, tY.Item2)
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| _ -> 0
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let scores =
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[| Tuple.Create("Jack", 78.8, 8)
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Tuple.Create("Abbey", 92.1, 9)
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Tuple.Create("Dave", 88.3, 9)
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Tuple.Create("Sam", 91.7, 8)
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Tuple.Create("Ed", 71.2, 5)
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Tuple.Create("Penelope", 82.9, 8)
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Tuple.Create("Linda", 99.0, 9)
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Tuple.Create("Judith", 84.3, 9) |]
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printfn "The values in unsorted order:"
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for score in scores do
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printfn $"{score}"
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printfn ""
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Array.Sort(scores, ScoreComparer<string, double, int>())
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printfn "The values in sorted order:"
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for score in scores do
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printfn $"{score}"
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// The example displays the following output
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// The values in unsorted order:
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// (Jack, 78.8, 8)
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// (Abbey, 92.1, 9)
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// (Dave, 88.3, 9)
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// (Sam, 91.7, 8)
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// (Ed, 71.2, 5)
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// (Penelope, 82.9, 8)
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// (Linda, 99, 9)
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// (Judith, 84.3, 9)
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//
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// The values in sorted order:
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// (Ed, 71.2, 5)
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// (Jack, 78.8, 8)
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// (Penelope, 82.9, 8)
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// (Judith, 84.3, 9)
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// (Dave, 88.3, 9)
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// (Sam, 91.7, 8)
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// (Abbey, 92.1, 9)
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// (Linda, 99, 9)
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// </Snippet2>

‎snippets/fsharp/System/TupleT1,T2,T3/System.Collections.IStructuralComparable.CompareTo/fs.fsproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net6.0</TargetFramework>
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</PropertyGroup>
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<ItemGroup>
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<Compile Include="compareto2.fs" />
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<Compile Include="compareto1.fs" />
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</ItemGroup>
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</Project>

‎snippets/fsharp/System/TupleT1,T2,T3/ToString/fs.fsproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net6.0</TargetFramework>
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</PropertyGroup>
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<ItemGroup>
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<Compile Include="tostring1.fs" />
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</ItemGroup>
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</Project>

‎snippets/fsharp/System/TupleT1,T2,T3/ToString/tostring1.fs‎

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// <Snippet1>
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open System
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let scores =
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[| Tuple.Create("Jack", 78.8, 8)
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Tuple.Create("Abbey", 92.1, 9)
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Tuple.Create("Dave", 88.3, 9)
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Tuple.Create("Sam", 91.7, 8)
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Tuple.Create("Ed", 71.2, 5)
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Tuple.Create("Penelope", 82.9, 8)
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Tuple.Create("Linda", 99.0, 9)
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Tuple.Create("Judith", 84.3, 9) |]
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Array.Sort scores
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for score in scores do
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printfn $"{score}"
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// The example displays the following output
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// (Abbey, 92.1, 9)
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// (Dave, 88.3, 9)
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// (Ed, 71.2, 5)
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// (Jack, 78.8, 8)
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// (Judith, 84.3, 9)
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// (Linda, 99, 9)
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// (Penelope, 82.9, 8)
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// (Sam, 91.7, 8)
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// </Snippet1>

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