getting the last item in a javascript object

Question

If I have an object like:

{ \'a\' : \'apple\', \'b\' : \'banana\', \'c\' : \'carrot\' }

If I don\'t know in advance that the list goes up

Answer 1

Use an array, not an object literal, if order matters.

list = ['apple', 'banana', 'carrot'];

Or something like

dict = {
 'a' : ['apple', 'awesome'],
 'b' : ['best friend']
};

Or even..

dict = [{letter:'a', list:['apple', 'awesome']},{letter:'b', list:['best friend']}];

The keys for dict are not guaranteed at all to be in order.

Answer 2

Yes, there is a way using Object.keys(obj). It is explained in this page:

var fruitObject = { 'a' : 'apple', 'b' : 'banana', 'c' : 'carrot' };
Object.keys(fruitObject); // this returns all properties in an array ["a", "b", "c"]

If you want to get the value of the last object, you could do this:

fruitObject[Object.keys(fruitObject)[Object.keys(fruitObject).length - 1]] // "carrot"