Beginning with .NET 8, you have the option to employ the novel collection expression to generate frequently used collection values. A collection expression comprises a concise syntax, which, upon evaluation, can be assigned to a wide array of collection types.

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Key Features of Collection Expressions:

Concise Syntax: Easily create collections using square brackets [] and comma-separated elements, such as [1, 2, 3].
Spread Operator (..): Seamlessly inline elements from existing collections, for instance, [1, ..otherList, 4].
Implicit Conversions: Collection expressions automatically convert to supported types, including arrays (int[], string[], etc.), spans (Span<T>, ReadOnlySpan<T>), lists (List<T>), and other types with collection initializers.

The Benefits of Collection Expressions:

Improved Readability: Enjoy a more concise and expressive syntax for creating collections.
Reduced Verbosity: Say goodbye to repetitive new keywords and type annotations.
Enhanced Code Clarity: Experience improved code maintainability and understanding.

Here’s how you could create and initialize a collection (array) before the introduction of .NET 8:

var days = new[] { "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", 
                             "FRIDAY", "SATURDAY", "SUNDAY" };

for (int index = 0; index < days.Length; index++)
{
    Console.WriteLine(days[index]);
}

string [] days = ["MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", 
                          "FRIDAY", "SATURDAY", "SUNDAY"];

for (int index = 0; index < days.Length; index++)
{
    Console.WriteLine(days[index]);
}

Collection expressions can be employed with the following types:

System.Span<T>
System.ReadOnlySpan<T>
Inline arrays
Arrays
Any situation involving a create method that uses a parameter type of ReadOnlySpan<T>
Any type that provides support for a collection initializer, such as List<T>.

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