2021-06-04.md

Date: June 4, 2021
Original Post: https://gist.github.com/ZacharyPatten/3b7d7d63bc5188d3f7c863639f14765d

Author Note: This is mainly a for-fun post. I don't necessary recommend anyone use the code. :D

Custom Range Syntax

using System;
using System.Collections.Generic;
using static Statics;

class Program
{
	static void Main()
	{
		foreach (int i in -6 -to- -4)
		{
			Console.WriteLine(i);
		}
		foreach (long l in -2 -to- 2)
		{
			Console.WriteLine(l);
		}
		foreach (char c in 'a'-to-'e')
		{
			Console.WriteLine(c);
		}
		string[] names = { "Sally", "Bob", "Joe", "Eric", "Patty" };
		foreach (string s in names.Where("Allen"-tᴏ-"Kevin"))
		{
			Console.WriteLine(s);
		}
	}
}

#region Nothing To See Here

public struct To1<T>
{
	public static To2<T> operator -(T a, To1<T> to) => new() { _a = a };
}

public struct To2<T>
{
	internal T _a;
	public static Range<T> operator -(To2<T> to, T b) => new() { _a = to._a, _b = b };
}

public struct Range<T>
{
	internal T _a;
	public T A => _a;
	internal T _b;
	public T B => _b;
}

public static class Extensions
{
	public static IEnumerator<int> GetEnumerator(this Range<int> range)
	{
		for (int i = range.A; i <= range.B; i++)
		{
			yield return i;
		}
	}

	public static IEnumerator<char> GetEnumerator(this Range<char> range)
	{
		for (char i = range.A; i <= range.B; i++)
		{
			yield return i;
		}
	}

	public static IEnumerable<string> Where(this IEnumerable<string> strings, Range<string> range)
	{
		foreach (string s in strings)
		{
			if (s.CompareTo(range.A) >= 0 && s.CompareTo(range.B) <= 0)
			{
				yield return s;
			}
		}
	}
}

public static class Statics
{
	public readonly static To1<int> to = default;
	public readonly static To1<string> tᴏ = default;
}

#endregion