using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var cats = new List<Cat> { new Cat("Fluffy"), new Cat("Meowista"), new Cat("Scratchy") };

        var (fluffy, scratchy) = cats.FindFirsts(

            x => x.Name == "Fluffy",

            x => x.Name == "Scratchy");

        Console.WriteLine($"{fluffy} {scratchy}");

    }

}

​

public static class FindExtensions

{

    public static T[] FindFirsts<T>(this IEnumerable<T> collection, params Func<T, bool>[] conditions)

    {

        if (conditions.Length == 0)

            return new T[] { };

​

        var unmatchedConditions = conditions.Length;

        var lookupWork = conditions

            .Select(c => (

                value: default(T),

                found: false,

                cond: c

            ))

            .ToArray();

        foreach (var item in collection) 

        {

            for (var i = 0; i < lookupWork.Length; i++)

            {

                if (!lookupWork[i].found && lookupWork[i].cond(item))

                { 

                    lookupWork[i].found = true;

                    lookupWork[i].value = item;

                    unmatchedConditions--;

                }

            }

            if (unmatchedConditions <= 0)

                break;

        }

        return lookupWork.Select(x => x.value).ToArray();

    }

}

​

public static class IEnumerableExt

{

    public static void Deconstruct<T>(this IEnumerable<T> seq, out T first, out T second)

    {

        first = seq.FirstOrDefault();

        second = seq.Skip(1).FirstOrDefault();

    }

}

​

class Cat

{ 

    public string Name { get; set; }

​

    public Cat(string name)

    {

        Name = name;

    }

​

    public override string ToString() => Name;

}

​