Copy array and push one element from another array to every copy

Question

I have two arrays, let's say a = [1, 2, 3] and b = [x, y, z].

How can I create third array like this c = [[1, 2, 3, x], [1, 2, 3, y], [1, 2, 3, z]] from them?

Thanks.

Answer 1

You can use map() method on b and then concat() each element on a .

 var a = [1, 2, 3], b = ['x', 'y', 'z'] var result = b.map(e => a.concat(e)); console.log(result) 

Answer 2

You can use .map() to do this, like so:

 var a = [1,2,3]; var b = ["x", "y", "z"]; var c = b.map(function (elem) { return a.concat(elem); }); console.log(c);