How to remove first element from int array

[DD2783]

I'm currently trying to remove the first element in an int array using objects in C#. I have just coded how to add an element to that start of the array and though it was just a case of changing a few things.

Here's the code for the addFirst() but i can't for the life of me figure out removeFirst()

        public void addFirst(int value)
        {
            if (isFull())
            {
                throw new Exception("List full");
            }
            else
            {
                for (int pos = size;pos > 0; pos-- )
                {
                    values[pos] = values[pos - 1];
                }             
                values[0] = value;
                size++;
            }
        }

[Rabbit]

What you need to do is move the value of the next cell into the current cell and then decrement the size of the array by 1.

[PsychoCoder]

You have a couple options, you could use the RemoteAt Method of the List<T>, that's your simple option, which would work like this:

List<int> list = new List<int>(){ 1, 2, 3, 4, 5, 6 };
list.RemoveAt(1);

Would remove the first element in the array.

If, however, you're forced to use arrays you could write an extension method like this one:

public static T[] RemoveAt<T>(this T[] source, int idx)
{
    T[] destination = new T[source.Length - 1];
    if( idx > 0 )
        Array.Copy(source, 0, destination, 0, idx);
 
    if( idx < source.Length - 1 )
        Array.Copy(source, idx + 1, destination, idx, source.Length - idx - 1);
 
    return destination;
}
 

Which could be used like above:

int[] array = new int[4] {2, 4, 6, 8};
array.RemoveAt(1);
 

Hope that helps :)