C# Code - Do you use collection expressions to keep your code clean?

var numbers1 = new List<int> {1, 2, 3, 4, 5};

❌ Figure: Figure: Bad example - Verbose way of constructing a list

var numbers2 = new[] { 1, 2, 3, 4, 5 };

😐 Figure: Figure: OK example - using implicit arrays

List<int> numbers3 = [1, 2, 3, 4, 5];

✅ Figure: Figure: Good example - using collection expressions

Another advantage of collection expressions is that they can be passed into methods accepting different types of list collections. The compiler is smart enough to determine the correct underlying type.

Foo([1,2,3]);
Foo2([1,2,3]);
Foo3([1,2,3]);

void Foo(IEnumerable<int> numbers)
{
    // Do work
}

void Foo2(List<int> numbers)
{
    // Do work
}

void Foo3(int[] numbers)
{
    // Do work
}

Figure: Versatile use of collection expressions in methods with varying collection types

For more information on collection expressions see here: learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/collection-expressions