//.NET 7 includes C# 11, which comes with many new enhancements

// read about it here: https://medium.com/entech-solutions/new-features-in-c-11-net-7-with-interactive-examples-c8e4e5ea1e5a

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using System;           

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var list1 = new int[] {1, 2, 3, 4};

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​

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Check(list1, "is [1, 2, 3, 4]", list1 is [1, 2, 3, 4]);

Check(list1, "is [1, 2, 3]", list1 is [1, 2, 3]);  

Check(list1, "is [1, _, 4]", list1 is [1, _, 4]); //must start with 1 and end with 4. array of size 3.

Check(list1, "is [1, ..., 4]", list1 is [1, .., 4]); //must start with 1 and end with 4. array of any size.

Check(list1, "is [1, ..., <4]", list1 is [1, .., <4]); //last item in array less then 4

Check(list1, "is [1, ..., >=4]", list1 is [1, .., >=4]);   //last item in array greater or equal to 4

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static void Check(int[] list, string description, bool isTrue)

{

    var listText = $"[" + String.Join(", ", list) + "]";

    Console.WriteLine(listText.PadRight(20) + description.PadRight(20) + isTrue);   

}