#UniqueInOrder #codewars

UniqueInOrder.cs

// Mine
using System.Collections.Generic;
using System.Linq;

public static class Kata
{
  public static IEnumerable<T> UniqueInOrder<T>(IEnumerable<T> iterable) 
  {
    var output = new List<T>();
    T newItem = default(T);
    foreach(var item in iterable)
    {
       if (!item.Equals(newItem))
       {
         newItem = item;
         output.Add(item);
       }
      
    }
    return output.Select(x => x);
  }
}

// better (dont forget to yield we are returning an enumerable!!)

public static class Kata
{
  public static IEnumerable<T> UniqueInOrder<T>(IEnumerable<T> iterable) 
  {
    T previous = default(T);
    foreach(T current in iterable)
    {
      if (!current.Equals(previous))
      {
        previous = current;
        yield return current;
      }
    }
  }
}

//Clever
public static class Kata
{
  public static IEnumerable<T> UniqueInOrder<T>(IEnumerable<T> iterable) 
  {
    return iterable.Where((x, i) => i == 0 || !Equals(x, iterable.ElementAt(i-1)));
    
  }
}