Adding/summing two arrays

Question

I\'ve encountered a purely hypothetical problem which feels like it has an easy solution if I find the right linq method...

I have two arrays of ints and I know they are

Answer 1

Zip it :)

var a = new int[] {1,2,3 };
var b = new int[] {4,5,6 };
a.Zip(b, (x, y) => x + y)

Answer 2

You can use the Select method.

int[] a = new[] { 1, 2, 3 };
int[] b = new[] { 10, 20, 30 };

var c = a.Select ((x, index) => x + b[index]).ToArray();

Answer 3

Without LINQ:

private static IEnumerable<int> AddArrays(IEnumerable<int> a1, IEnumerable<int> a2)
{
    var e1 = a1.GetEnumerator();
    var e2 = a2.GetEnumerator();

    while (e1.MoveNext() && e2.MoveNext())
        yield return e1.Current + e2.Current;
}

Answer 4

public static int[] AddArrays(int[] a, int[] b)

{
     return a.Zip(b, (x,y) => x+y).ToArray();
}

Answer 5

IList<int> first = new List<int> { 2, 3, 4, 5 };
IList<int> second = new List<int> { 2, 3, 4, 5 };

var result = Enumerable.Zip(first, second, (a, b) => a + b);