C#: Altering values for every item in an array

Question

I\'m wondering if there is built-in .NET functionality to change each value in an array based on the result of a provided delegate. For example, if I had an array {1,

Answer 1

Here is another solution for M x N arrays, where M and N are not known at compile time.

    // credit: https://blogs.msdn.microsoft.com/ericlippert/2010/06/28/computing-a-cartesian-product-with-linq/
    public static IEnumerable> CartesianProduct(IEnumerable> sequences)
    {
        IEnumerable> result = new[] { Enumerable.Empty() };
        foreach (var sequence in sequences)
        {
            // got a warning about different compiler behavior
            // accessing sequence in a closure
            var s = sequence;
            result = result.SelectMany(seq => s, (seq, item) => seq.Concat(new[] { item }));
        }
        return result;
    }


    public static void ConvertInPlace(this Array array, Func projection)
    {
        if (array == null)
        {
            return;
        }

        // build up the range for each dimension
        var dimensions = Enumerable.Range(0, array.Rank).Select(r => Enumerable.Range(0, array.GetLength(r)));

        // build up a list of all possible indices
        var indexes = EnumerableHelper.CartesianProduct(dimensions).ToArray();

        foreach (var index in indexes)
        {
            var currentIndex = index.ToArray();
            array.SetValue(projection(array.GetValue(currentIndex)), currentIndex);
        }
    }