Reverse an array of objects

Question

I have a static class containing arrays of objects.

public static Waypoint[] AtoB
        {
            get
            {
                return new Waypoint[] {
                    new Waypoint(49.251f,-851.837f),
                    new Waypoint(66.7397f,-843.165f),
                    new Waypoint(77.8777f,-825.462f)
                };
            }
        }

Now I want to create another array of Waypoint called BtoA that is the same as AtoB but reverse order. So something like:

public static Waypoint[] BtoA
    {
        get { return AtoB.Reverse(); }
    }

Is this possible?

Answer 1

You can save reversed sequence to new array with ToArray() extension call:

return AtoB.Reverse().ToArray();

In this case you will have two arrays in memory - you will have array returned by AtoB property, then you will create reverse iterator for that array, and finally you will save reversed sequence to completely new array.

Or you can reverse original array with Array.Reverse(array):

var array = AtoB;
Array.Reverse(array);
return array;

In this case you will have single array which was created in AtoB property - you just reverse items of that array instance.

NOTE: Your code is not working, because Reverse() extension creates ReverseIterator which is not an array - it is of type IEnumerable<Waypoint>. So, one more option for you is changing type of BtoA property to IEnumerable<Waypoint>.