Removes the first item from a list and returns that item.
This function changes the length of the list. The shift() function works
on a list type array, but not on a tuple since tuples are immutable.
This function generates a change (except when called on a variable).
list.shift()
None
The removed item from the list. A lookup_err() is raised if the list is empty.
This code show an example usage of shift():
(list = [1, 2, 3]).shift(); // 1
list;
Return value in JSON format
[
2,
3
]