mapobject

use a map, like an object

ObjectMap

Use an ES6 Map using object syntax, so

map = oMap();
//these are the same 
map.set('abc',9);
map.abc = 9;
//as are these 
map.get('abc');
map.abc;
//and these 
map.delete('abc');
delete map.abc;

it should be noted that using it in the object style coerses everything to a string so

//these are not equivilent 
map.set(3);
map[3];
//these are 
map.set('3');
map[3];

you can also itererate it like a regular object (for in) and you will only get the keys from the map

lastly if you iterate it with the new iterator protocol (for of) you will get arrays of length 2 of both keys and values