ช่วงกับอาร์เรย์และสตริง

using System;

int[] data = { 10, 20, 30, 40, 50 };
int[] middle = data[1..3];
Console.WriteLine(string.Join(",", middle)); // 20,30

using System;

int[] original = { 1, 2, 3, 4 };
int[] slice = original[0..2];
slice[0] = 99;
Console.WriteLine(original[0]); // 1 (unchanged)
Console.WriteLine(slice[0]);    // 99

using System;

string text = "Hello, World";
string hello = text[0..5];
Console.WriteLine(hello); // Hello

using System;

string file = "report.csv";
string ext = file[^3..];
Console.WriteLine(ext); // csv

using System;

string s = "Coddy";
char last = s[^1];
Console.WriteLine(last); // y

using System;

string quoted = "[value]";
string inner = quoted[1..^1];
Console.WriteLine(inner); // value

using System;

string code = "2026-05-30";
string year = code[..4];
string month = code[5..7];
string day = code[8..];
Console.WriteLine(year + " / " + month + " / " + day); // 2026 / 05 / 30

using System;

ReadOnlySpan<char> span = "Hello, World".AsSpan();
ReadOnlySpan<char> word = span[7..];
Console.WriteLine(word.ToString()); // World

using System;

int[] data = { 2, 4, 6, 8, 10 };
foreach (int n in data[1..4])
    Console.Write(n + " "); // 4 6 8
Console.WriteLine();

using System;

int[] d = { 1, 2, 3 };
try { var _ = d[1..10]; }
catch (ArgumentOutOfRangeException) { Console.WriteLine("slice out of bounds"); }

using System;

string email = "ada@coddy.dev";
int at = email.IndexOf('@');
string user = email[..at];
string domain = email[(at + 1)..];
Console.WriteLine(user + " | " + domain); // ada | coddy.dev