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Subtractable.cs
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Subtractable.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using Xunit;
using static LanguageExt.Prelude;
using LanguageExt.ClassInstances;
namespace LanguageExt.Tests
{
public class Subtractable
{
[Fact]
public void OptionalNumericSubtract()
{
var x = Some(20);
var y = Some(10);
var z = subtract<TInt, int>(x, y);
Assert.True(z == 10);
}
[Fact]
public void OptionalListSubtract()
{
var x = Some(List(1, 2, 3));
var y = Some(List(1, 2));
var z = x.SubtractT<TInt, int>(y);
// 1 - 1 = 0
// 1 - 2 = -1
// 2 - 1 = 1
// 2 - 2 = 0
// 3 - 1 = 2
// 3 - 2 = 1
match(z,
Some: list =>
{
Assert.True(list.Count == 6);
Assert.True(list[0] == 0);
Assert.True(list[1] == -1);
Assert.True(list[2] == 1);
Assert.True(list[3] == 0);
Assert.True(list[4] == 2);
Assert.True(list[5] == 1);
},
None: () => Assert.True(false)
);
}
[Fact]
public void OptionalSetSubtract()
{
var x = Some(Set(1,2,3));
var y = Some(Set(2,3,4));
var z = x.SubtractT<TInt, int>(y);
// 1 - 2 = -1
// 1 - 3 = -2
// 1 - 4 = -3
// 2 - 2 = 0
// 2 - 3 = -1
// 2 - 4 = -2
// 3 - 2 = 1
// 3 - 3 = 0
// 3 - 4 = -1
// -3, -2, -1, 0, 1
match(z,
Some: set =>
{
Assert.True(set.Count == 5);
Assert.True(set.Contains(-3));
Assert.True(set.Contains(-2));
Assert.True(set.Contains(-1));
Assert.True(set.Contains(0));
Assert.True(set.Contains(1));
},
None: () => Assert.True(false)
);
}
}
}