Produces the exact same content as the input array, but in different orders. IMMUTABLE. - CSharp System

CSharp examples for System:Array Element

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Description

Produces the exact same content as the input array, but in different orders. IMMUTABLE.

Demo Code


using System.Linq;
using System.Collections.Generic;
using System.Collections;
using System;/* ww  w.  ja v a2 s . c om*/

public class Main{
        /// <summary>
        /// Produces the exact same content as the input array, but in different orders.
        /// 
        /// IMMUTABLE.
        /// </summary>
        /// <typeparam name="T">The type of entity in the array</typeparam>
        /// <param name="array">The target input</param>
        /// <returns>A randomized, shuffled copy of the original array</returns>
        public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> array)
        {
            var original = array.ToList();
            if (original.Count <= 1) // can't shuffle an array with 1 or fewer elements
                return original;

            /*
             * https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle
             */
            var newList = new T[original.Count];

            for (var i = 0; i < original.Count;i++)
            {
                var j = Faker.Generators.Numbers.Int(0, i);
                if (j != i)
                    newList[i] = newList[j];
                newList[j] = original[i];
            }
            return newList;
        }
}

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