JustOnePixel JustOnePixel - 1 year ago 112
C# Question

C#: Altering values for every item in an array

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

and a delegate that returns the square of each value, I would like to be able to run a method that takes the array and delegate, and returns
. Does anything like this exist already?

Answer Source

Not that I'm aware of (replacing each element rather than converting to a new array or sequence), but it's incredibly easy to write:

public static void ConvertInPlace<T>(this IList<T> source, Func<T, T> projection)
    for (int i = 0; i < source.Count; i++)
        source[i] = projection(source[i]);


int[] values = { 1, 2, 3 };
values.ConvertInPlace(x => x * x);

Of course if you don't really need to change the existing array, the other answers posted using Select would be more functional. Or the existing ConvertAll method from .NET 2:

int[] values = { 1, 2, 3 };
values = Array.ConvertAll(values, x => x * x);

This is all assuming a single-dimensional array. If you want to include rectangular arrays, it gets trickier, particularly if you want to avoid boxing.

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