Adds new items to the end of a list, and returns the new length.
This function generates a change (except when called on a variable).
list.push(item1, item2, ..., itemX)
Returns the new length of the list.
This code pushes values to a list:
list = [1, 2, 3];
list.push(4, 5, 6); // Returns the new length, 6
list;
Return value in JSON format
[1, 2, 3, 4, 5, 6]