Python offers the following syntax to initialize a python List functionally:
mylist = [item for item in iterable]
Is there a similar syntax in C# for initializing a C# List?
EDIT:
I guess I should be more specific. I'm trying to emulate the following syntax:
mylist = [operation(item) for item in iterable]
Assuming iterable is an IEnumerable<T> of some sort, you can use the List<T>(IEnumerable<T>) constructor overload to initialize a new list:
mylist = new List(iterable);
You can also call the Linq Enumberable.ToList extension method:
mylist = iterable.ToList();
Specifically, it looks like you're after how to do the equivalent of list comprehension. You can use Linq's Enumerable.Select method and a lambda. For example, to match your edit:
mylist = iterable.Select(item => operation(item)).ToList();
As a bonus, if you were trying to do the following (adding a condition):
mylist = [operation(item) for item in iterable if item > 42]
You would add a call to Enumerable.Where in the chain:
mylist = iterable.Where(item => item > 42).Select(item => operation(item)).ToList();
You may create a C# List of items, say ints, in the following manor:
List<int> myList = new List<int>{1, 2, 3, 4,};
So you don't need to specify the initial size, it infers it from your initial objects. If you instead have an enumerable, see the code below
IEnumerable<int> existingEnumerable = ...
List<int> myList = new List<int>(existingEnumerable);
Let us know if this fits your needs.
It appears you just turn an iterable collection into an array.
In C#, there is a .ToArray() extension method on a collection type. Maybe that is what you need.
It would be:
result=iterable.ToArray();
after the edit, it appears you are to transform list.
myList=iterable.Select(i=> Operation(i));
