Using Linq is there a way to perform an operation on every element in an Array

Question

If I have an array

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

Using linq can I perform an operation on each element instead of doing something like this?

for (int i = 0; i < foo.Length; i++)
{
    foo[i] = foo[i] / 2; //divide each element by 2
}

Answer 1

var foo = new int[] { 1,2,3,4,5 };
foo = foo.Select(x=>x/2).ToArray();

Answer 2

Those are bad solutions in my opinion. Select().ToArray() creates new collection, meaning that it might cause both performance and memory issues for larger arrays. If you want a shorter syntax - write extension methods:

static class ArrayExtensions
{
    public static void ForEach<T>(this T[] array, Func<T,T> action)
    {
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = action(array[i]);
        }
    }

    public static void ForEach<T>(this T[] array, Action<T> action)
    {
        for (int i = 0; i < array.Length; i++)
        {
            action(array[i]);
        }
    }   
}

//usage
foo.ForEach(x => x/2)
foo.ForEach(x => Console.WriteLine(x));