Create an array that is the union of all members in a, with all members of b that are not already in a. - CSharp System

CSharp examples for System:Array Create

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Description

Create an array that is the union of all members in a, with all members of b that are not already in a.

Demo Code


using System.Linq;
using System.Collections.Generic;
using System;//  w w w  .ja  v a  2 s . c  o m

public class Main{
        /// <summary>
        /// Create an array that is the union of all members in a, with all members of b that are not already in a.
        /// </summary>
        public static T[] Union<T>(this T[] a, T[] b)
        {
            if (a == b)
                return a;
            if (a.Length == 0)
                return b;
            if (b.Length == 0)
                return a;
            if (a.Length == 1)
            {
                if (b.Length == 1)
                    return a[0].Equals(b[0]) ? a : new[] { a[0], b[0] };
                return b.Union(a[0]);
            }
            if (b.Length == 1)
                return a.Union(b[0]);
            return Enumerable.Union(a, b).ToArray();
        }
        /// <summary>
        /// Create an array that is the union of all members in a, with b added if b is not an element of a.
        /// </summary>
        public static T[] Union<T>(this T[] a, T b)
        {
            if (a.Length == 0)
                return new[] { b };
            if (Array.IndexOf(a, b) >= 0)
                return a;
            var res = new T[a.Length + 1];
            Array.Copy(a, 0, res, 0, a.Length);
            res[res.Length - 1] = b;
            return res;
        }
}

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