Does C# 7 have array/enumerable destructuring?

Question

In Javascript ES6, you are able to destructure arrays like this:

const [a,b,...rest] = someArray;

where a is the first element

Answer 1

In C# you will need to write your own, like this one I'm using:

public static class ArrayExtensions
    {
        public static void Deconstruct<T>(this T[] array, out T first, out T[] rest)
        {
            first = array.Length > 0 ? array[0] : default(T);
            rest = array.Skip(1).ToArray();
        }

        public static void Deconstruct<T>(this T[] array, out T first, out T second, out T[] rest)
            => (first, (second, rest)) = array;

        public static void Deconstruct<T>(this T[] array, out T first, out T second, out T third, out T[] rest)
            => (first, second, (third, rest)) = array;

        public static void Deconstruct<T>(this T[] array, out T first, out T second, out T third, out T fourth, out T[] rest)
            => (first, second, third, (fourth, rest)) = array;

        public static void Deconstruct<T>(this T[] array, out T first, out T second, out T third, out T fourth, out T fifth, out T[] rest)
            => (first, second, third, fourth, (fifth, rest)) = array;

// .. etc.
    }

Then simply do:

var (first, second,_ , rest) = new[] { 1, 2, 3, 4 }

Answer 2

Really quick: No.

C# does not support destructuring for Arrays yet.

Currently, I cannot find any information of this on the roadmap, either. Seems like there will be a lot of waiting involved until we get this syntactic sugar by default.

As @Nekeniehl added in the comments, it can be implemented though: gist.github.com/waf/280152ab42aa92a85b79d6dbc812e68a