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https://github.com/oliverbooth/X10D
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Add IReadOnlyList<T>.Slice
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@ -21,6 +21,7 @@
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- X10D: Added `IList<T>.RemoveRange(Range)`
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- X10D: Added `IList<T>.Swap(IList<T>)` (#62)
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- X10D: Added `IReadOnlyList<T>.IndexOf(T[, int[, int]])`
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- X10D: Added `IReadOnlyList<T>.Slice(int[, int]])`
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- X10D: Added `Point.IsOnLine(LineF)`, `Point.IsOnLine(PointF, PointF)`, and `Point.IsOnLine(Vector2, Vector2)`
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- X10D: Added `PointF.IsOnLine(LineF)`, `PointF.IsOnLine(PointF, PointF)`, and `PointF.IsOnLine(Vector2, Vector2)`
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- X10D: Added `Point.ToSize()`
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@ -216,6 +216,58 @@ public class ListTests
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Assert.ThrowsException<ArgumentNullException>(() => ((List<int>?)null)!.Shuffle());
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}
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[TestMethod]
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public void Slice_ShouldReturnCorrectValue_GivenStartIndex()
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{
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int[] array = {0, 1, 2, 3, 4, 5};
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CollectionAssert.AreEqual(new[] {2, 3, 4, 5}, array.Slice(2).ToArray());
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}
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[TestMethod]
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public void Slice_ShouldReturnCorrectValue_GivenStartIndexAndLength()
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{
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int[] array = {0, 1, 2, 3, 4, 5};
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CollectionAssert.AreEqual(new[] {2, 3, 4}, array.Slice(2, 3).ToArray());
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}
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[TestMethod]
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public void Slice_ShouldReturnEmptyList_ForEmptyList()
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{
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int[] array = Array.Empty<int>();
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CollectionAssert.AreEqual(Array.Empty<int>(), array.Slice(0).ToArray());
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CollectionAssert.AreEqual(Array.Empty<int>(), array.Slice(0, 0).ToArray());
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}
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[TestMethod]
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public void Slice_ShouldThrowArgumentNullException_GivenNullList()
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{
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int[]? array = null;
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Assert.ThrowsException<ArgumentNullException>(() => array!.Slice(0));
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Assert.ThrowsException<ArgumentNullException>(() => array!.Slice(0, 0));
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}
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[TestMethod]
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public void Slice_ShouldThrowArgumentOutOfRangeException_GivenNegativeCount()
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{
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int[] array = Array.Empty<int>();
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Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Slice(0, -1));
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}
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[TestMethod]
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public void Slice_ShouldThrowArgumentOutOfRangeException_GivenNegativeStartIndex()
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{
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int[] array = Array.Empty<int>();
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Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Slice(-1));
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Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Slice(-1, 0));
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}
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[TestMethod]
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public void Slice_ShouldThrowArgumentOutOfRangeException_GivenInvalidStartIndexCountPair()
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{
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int[] array = {0, 1, 2};
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Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Slice(2, 4));
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}
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[TestMethod]
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public void Swap_ShouldThrowArgumentNullException_GivenNullSource()
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{
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@ -1,4 +1,3 @@
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using System.Diagnostics;
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using System.Diagnostics.Contracts;
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using X10D.Core;
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@ -320,6 +319,80 @@ public static class ListExtensions
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}
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}
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/// <summary>
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/// Forms a slice out of the current list that begins at a specified index.
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/// </summary>
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/// <param name="source">The list to slice.</param>
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/// <param name="start">The index at which to begin the slice.</param>
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/// <typeparam name="T">The type of elements in <paramref name="source" />.</typeparam>
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/// <returns>
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/// A list that consists of all elements of the current list from <paramref name="start" /> to the end of the list.
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/// </returns>
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/// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
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/// <exception cref="ArgumentOutOfRangeException">
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/// <paramref name="start" /> is less than zero or greater than <see cref="IReadOnlyList{T}.Count" />.
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/// </exception>
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public static IReadOnlyList<T> Slice<T>(this IReadOnlyList<T> source, int start)
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{
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#if NET6_0_OR_GREATER
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ArgumentNullException.ThrowIfNull(source);
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#else
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if (source is null)
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{
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throw new ArgumentNullException(nameof(source));
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}
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#endif
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return source.Slice(start, source.Count - start);
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}
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/// <summary>
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/// Forms a slice out of the current list that begins at a specified index for a specified length.
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/// </summary>
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/// <param name="source">The list to slice.</param>
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/// <param name="start">The index at which to begin the slice.</param>
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/// <param name="length">The desired length for the slice.</param>
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/// <typeparam name="T">The type of elements in <paramref name="source" />.</typeparam>
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/// <returns>
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/// A list that consists of all elements of the current list from <paramref name="start" /> to the end of the list.
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/// </returns>
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/// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
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/// <exception cref="ArgumentOutOfRangeException">
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/// <paramref name="start" /> or <paramref name="start" /> + <paramref name="length" /> is less than zero or greater than
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/// <see cref="IReadOnlyList{T}.Count" />.
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/// </exception>
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public static IReadOnlyList<T> Slice<T>(this IReadOnlyList<T> source, int start, int length)
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{
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#if NET6_0_OR_GREATER
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ArgumentNullException.ThrowIfNull(source);
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#else
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if (source is null)
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{
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throw new ArgumentNullException(nameof(source));
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}
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#endif
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if (start < 0 || start > source.Count)
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{
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throw new ArgumentOutOfRangeException(nameof(start), ExceptionMessages.IndexOutOfRange);
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}
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if (length < 0 || length > source.Count - start)
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{
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throw new ArgumentOutOfRangeException(nameof(length), ExceptionMessages.CountMustBeInRange);
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}
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var sliced = new List<T>();
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int endIndex = start + length;
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for (int index = start; index < endIndex; index++)
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{
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sliced.Add(source[index]);
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}
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return sliced.AsReadOnly();
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}
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/// <summary>
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/// Swaps all elements in a list with the elements in another list.
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/// </summary>
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