push_from_end.js

> db.alphabet.insert({
      "_id": "22222", 
      "array": ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j']
  })
// We missed the 'i'!
// Let's add it in the position before the last element.
> db.alphabet.update(
      { "_id": "22222" },
      {
          $push: {
              array: {
              $each: ['i'],
              $position: -1
          }
      }
  })
// Check the results:
> db.alphabet.find({ "_id": "22222" })
{ "array" : [ "a", "b", "c", "d", "e", "f", "g", "h", "i", "j" ] }v