using System;
using System.Collections.Generic;
class Program
{
private static IEnumerable<string> _plants = new[] { "Apple", "Pear", "Sunflower", "Carrot" };
static void Main(string[] args)
{
Console.WriteLine("Classic:");
foreach(var fruit in GetFruits())
{
Console.WriteLine(fruit);
}
Console.WriteLine("\r\nYield return:");
foreach (var fruit in GetFruitsWithYield())
{
Console.WriteLine(fruit);
}
}
private static IEnumerable<string> GetFruits()
{
var result = new List<string>();
foreach(var plant in _plants)
{
if(plant == "Apple" || plant == "Pear")
{
result.Add(plant);
}
}
return result;
}
private static IEnumerable<string> GetFruitsWithYield()
{
foreach (var plant in _plants)
{
if (plant == "Apple" || plant == "Pear")
{
yield return plant;
}
}
}
}
