[beta] Arr is not changed to [1, 2, 3, 4, 5, 6], but to [1, 2, 3, [4, 5, 6]]

Challenge add-elements-to-the-end-of-an-array-using-concat-instead-of-push has an issue. User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36.

In following example:

var arr = [1, 2, 3];
arr.push([4, 5, 6]);
// arr is changed to [1, 2, 3, 4, 5, 6]
// Not the functional programming way

arr is not changed to [1, 2, 3, 4, 5, 6], but to [1, 2, 3, [4, 5, 6]]

[tommygebru]

Oh I see in the example 👍 I will see if we can change this 😄 @Snip3rSVK

[4mifix]

Nothing is wrong with this challenge. The challenge is asking you to use the actual word CONCAT and remember to start your code before the return statement. I did this challenge and it worked. The key is in the wording right above Run Test. I will help you out with a little snippet you can figure out the rest var res = first.concat(second); . You have to change a word in the return statement.