Border elements in JavaScript
Given the following array:
[1, 2, 3]
Display the first element of this array.
Given the following array:
[1, 2, 3]
Display the last element of this array.
Given the following array:
[1, 2, 3]
Add the elements 4, 5,
6 to its end.
Given the following array:
[1, 2, 3]
Add the elements 4, 5,
6 to its start.
