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2013-09-18T07:45:41.067
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To rotate array, do <code>a.Slice(1, null).Concat(a.Slice(null, 1))</code>. Here's my stab at it. <code>a.Slice(step: -1)</code> gives a reversed copy as <code>a[::-1]</code>. <pre><code>/// <summary> /// Slice an array as Python. /// </summary> /// <typeparam name="T"></typeparam> /// <param name="array"></param> /// <param name="start">start index.</param> /// <param name="end">end index.</param> /// <param name="step">step</param> /// <returns></returns> /// <remarks> /// http://docs.python.org/2/tutorial/introduction.html#strings /// +---+---+---+---+---+ /// | H | e | l | p | A | /// +---+---+---+---+---+ /// 0 1 2 3 4 5 /// -6 -5 -4 -3 -2 -1 /// </remarks> public static IEnumerable<T> Slice<T>(this T[] array, int? start = null, int? end = null, int step = 1) { array.NullArgumentCheck("array"); // step if (step == 0) { // handle gracefully yield break; } // step > 0 int _start = 0; int _end = array.Length; // step < 0 if (step < 0) { _start = -1; _end = -array.Length - 1; } // inputs _start = start ?? _start; _end = end ?? _end; // get positive index for given index Func<int, int, int> toPositiveIndex = (int index, int length) => { return index >= 0 ? index : index + length; }; // start if (_start < -array.Length || _start >= array.Length) { yield break; } _start = toPositiveIndex(_start, array.Length); // end if (_end < -array.Length - 1) { yield break; } if (_end > array.Length) { _end = array.Length; } _end = toPositiveIndex(_end, array.Length); // slice if (step > 0) { // start, end if (_start > _end) { yield break; } for (int i = _start; i < _end; i += step) { yield return array[i]; } } else { // start, end if (_end > _start) { yield break; } for (int i = _start; i > _end; i += step) { yield return array[i]; } } } </code></pre> nunit tests: <pre><code>[Test] // normal cases [TestCase(3, 5, 1, 3, 4)] [TestCase(0, 5, 1, 0, 4)] [TestCase(3, null, 1, 3, 9)] [TestCase(0, null, 1, 0, 9)] [TestCase(null, null, 1, 0, 9)] [TestCase(0, 10, 1, 0, 9)] [TestCase(0, int.MaxValue, 1, 0, 9)] [TestCase(-1, null, 1, 9, 9)] [TestCase(-2, null, 1, 8, 9)] [TestCase(0, -2, 1, 0, 7)] // corner cases [TestCase(0, 0, 1, null, null)] [TestCase(3, 5, 2, 3, 3)] [TestCase(3, 6, 2, 3, 5)] [TestCase(100, int.MaxValue, 1, null, null)] [TestCase(int.MaxValue, 1, 1, null, null)] [TestCase(-11, int.MaxValue, 1, null, null)] [TestCase(-6, -5, 1, 4, 4)] [TestCase(-5, -6, 1, null, null)] [TestCase(-5, -5, 1, null, null)] [TestCase(0, -10, 1, null, null)] [TestCase(0, -11, 1, null, null)] [TestCase(null, null, 100, 0, 0)] // -ve step [TestCase(null, null, -1, 9, 0)] [TestCase(-7, -5, -1, null, null)] [TestCase(-5, -7, -1, 5, 4)] [TestCase(-5, -7, -2, 5, 5)] [TestCase(-7, null, -1, 3, 0)] public void Slice01(int? s, int? e, int i, int? first, int? last) { var a = new[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; var slice = a.Slice(start: s, end: e, step: i).ToArray(); Print(slice); if (first.HasValue) { Assert.AreEqual(first, slice.First()); } if (last.HasValue) { Assert.AreEqual(last, slice.Last()); } } </code></pre>
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