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#pragma warning disable CS1591
using System;
using System.Collections.Generic;
namespace MediaBrowser.Common.Extensions
{
// The MS CollectionExtensions are only available in netcoreapp
public static class CollectionExtensions
{
private static readonly Random _rng = new Random();
/// <summary>
/// Shuffles the items in a list.
/// </summary>
/// <param name="list">The list that should get shuffled.</param>
/// <typeparam name="T">The type.</typeparam>
public static void Shuffle<T>(this IList<T> list)
{
int n = list.Count;
while (n > 1)
{
n--;
int k = _rng.Next(n + 1);
T value = list[k];
list[k] = list[n];
list[n] = value;
}
}
public static TValue GetValueOrDefault<TKey, TValue>(this IReadOnlyDictionary<TKey, TValue> dictionary, TKey key)
{
dictionary.TryGetValue(key, out var ret);
return ret;
}
/// <summary>
/// Copies all the elements of the current collection to the specified list
/// starting at the specified destination array index. The index is specified as a 32-bit integer.
/// </summary>
/// <param name="source">The current collection that is the source of the elements.</param>
/// <param name="destination">The list that is the destination of the elements copied from the current collection.</param>
/// <param name="index">A 32-bit integer that represents the index in <c>destination</c> at which copying begins.</param>
/// <typeparam name="T"></typeparam>
public static void CopyTo<T>(this IReadOnlyList<T> source, IList<T> destination, int index = 0)
{
for (int i = 0; i < source.Count; i++)
{
destination[index + i] = source[i];
}
}
}
}
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