Javascript new Array and join() method

Question

Inspired by this popular speech I wanted to figure out some issue related to creating arrays. Let\'s say I am creating new array with:

Array(3)

Answer 1

Join combines the elements in an array with the specified delimiter.

So, since there are 3 elements, you only need 2 delimiters (between 1st and 2nd, and between 2nd and 3rd).

var a = [1,2,3];
a.join(','); //1,2,3
a.join('test'); // 1test2test3