CODEWITHSUNDEEP
c#arrays
UKM
UKM

Reputation: 305

Virtually shifting an array

I am using C#. I have an array of size 10. I want to pass it to a function, but only from the second element. In C, this is how I would implement it

myfunc( myarray + 1 )

Effectively I am virtually shifting the array / deleting the first element.

How do I implement this in C# ?

Upvotes: 3

Views: 122

Answers (3)

Reed Copsey
Reed Copsey

Reputation: 564851

There are four options here:

  1. Pass in an index, and use that in your function
  2. Make your function use IEnumerable<T> instead of an array (T[]), then use myArray.Skip(1).
  3. Use skip, but convert back to an array. This copies the array elements, however.
  4. Use an ArraySegment<T> instead of an array for your function.

This really depends on whether you have control over the usage within your myfunc function. If that function must accept an array, and you can't pass an index, you're going to be stuck creating a copy of the array.

Upvotes: 4

Mark Byers
Mark Byers

Reputation: 839114

If you're using .NET 3.5, the easiest is to use Skip(1) then convert back to an array.

myFunc(myArray.Skip(1).ToArray());

If performance is an issue then you will either need to construct a new array manually or change your function to accept an index parameter.

Upvotes: 4

Justin Ethier
Justin Ethier

Reputation: 134255

You could pass an index to the function also, and only access the array beginning at that index.

Upvotes: 1

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