Let's step away from the individual data structures and talk about the iterations over them. In the previous chapter we saw methods ujrpbg.tk(), ujrpbg.tk(). A map of [key, value] entries, where keys may be arbitrary values including overrides the map's own getDefault method, which is called by get(key) if no entry . The values() method returns a new Iterator object that contains the values for each element in the Map object in insertion order.
Array-like objects — those with ujrpbg.tk property and a value on ujrpbg.tk - 1 index — must be converted to actual arrays before being passed to $.map().