JS array question

Question

why c does not become part of the arr, yet when calling arr.key it exists?

var arr = [];
arr[0] = "x";
arr[1] = "y";
arr.key = "c";
alert(arr.length);

Answer 1

Similarly, the array methods are also only applied to the elements with numeric indexes.

Answer 2

the length property only applied to the elements with numeric indexes.

Answer 3

To add new element to a Array use 'push' method.

Code:
arr.push("c");

Answer 4

Hi Thomas. Thanks for your reply. However, rather than a solution, I am after being able to understand what's happening with c in this example.

Answer 5

thanks Calvin. and why when I call the arr it returns only x,y? (not c)