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🐎 Implement Fisher-Yates for IList<T>.Shuffle()
Resolves #18 but leaves string.Shuffle unable to be compiled for now
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@ -56,49 +56,28 @@ namespace X10D
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}
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/// <summary>
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/// Shuffles an enumerable.
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/// Reorganizes the elements in a list by implementing a Fisher-Yates shuffle.
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/// </summary>
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/// <typeparam name="T">The collection type.</typeparam>
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/// <param name="source">The collection to shuffle.</param>
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/// <returns>Returns <paramref name="source" /> shuffled.</returns>
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public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> source)
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{
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return source.Shuffle(new Random());
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}
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/// <summary>
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/// Shuffles an enumerable.
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/// </summary>
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/// <typeparam name="T">The collection type.</typeparam>
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/// <param name="source">The collection to shuffle.</param>
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/// <typeparam name="T">The element type.</typeparam>
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/// <param name="source">The <see cref="IList{T}" /> to shuffle.</param>
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/// <param name="random">The <see cref="Random" /> instance.</param>
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/// <returns>Returns <paramref name="source" /> shuffled.</returns>
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public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> source, Random random)
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public static void Shuffle<T>(this IList<T> source, System.Random? random = null)
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{
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return source.OrderBy(_ => random.Next());
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}
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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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/// <summary>
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/// Shuffles a list.
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/// </summary>
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/// <typeparam name="T">The collection type.</typeparam>
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/// <param name="source">The collection to shuffle.</param>
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/// <returns>Returns <paramref name="source" /> shuffled.</returns>
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public static IEnumerable<T> Shuffle<T>(this IList<T> source)
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{
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return source.Shuffle(new Random());
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}
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random ??= RandomExtensions.Random;
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/// <summary>
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/// Shuffles a list.
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/// </summary>
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/// <typeparam name="T">The collection type.</typeparam>
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/// <param name="source">The collection to shuffle.</param>
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/// <param name="random">The <see cref="Random" /> instance.</param>
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/// <returns>Returns <paramref name="source" /> shuffled.</returns>
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public static IEnumerable<T> Shuffle<T>(this IList<T> source, Random random)
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{
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return source.OrderBy(_ => random.Next());
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var count = source.Count;
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while (count > 0)
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{
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var index = random.Next(count--);
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var temp = source[count];
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source[count] = source[index];
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source[index] = temp;
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}
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}
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}
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}
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