is it possible to define 2 dimensional sets in Javascript

Question

Is it possible to define a 2 dimensional set in Javascript, which could look as follows:

let set = {}{};

and then to access this like a 2 dimensional array as set[][]; ?

By the way, an Array is not suitable for my purpose, because I need to index with strings instead of numbers.

Do you mean "can an object's values be objects?" Because in that case: yes. — jonrsharpe, Jun 11 '20 at 20:42
I'm no mathematician but I don't know what "2 dimensional set" means. *edit* I guess "set of sets"? — Pointy, Jun 11 '20 at 20:42
Sets don't have indexes, so "index with strings instead of numbers" doesn't make sense. — Barmar, Jun 11 '20 at 20:44

score 0 · Answer 1 · answered Jun 11 '20 at 20:46

0

What you're describing doesn't seem like sets, you seem to be talking about an object whose values are other objects, e.g.

let set = {
    a: {x: 1, y: 2},
    b: {x: 10, y: 15}
}

You can then access this as set.a.x or set['b']['y']

answered Jun 11 '20 at 20:46

Barmar

I have a combobox of several types as innerHTML and to each type belong several ids. So in that case each value should be a set of the corresponding ids. The types and corresponding ids appear dynamically. – deppensido Jun 11 '20 at 21:16
Don't put code in comments; and if you do, use backticks to delimit it, not [code]. – Barmar Jun 11 '20 at 21:23
the example you gave above is as similar as what I need. Is it possible to define it more general as: let set = { {}, {} } ? I just tried it, but doesn't work – deppensido Jun 11 '20 at 21:25
No, the elements of objects have to be `key: value` pairs. You can do `let set = {a: {}, b: {}}`. You can also just do `let set = {}` and you can add properties as needed like `set['a'] = {}` – Barmar Jun 11 '20 at 21:30
what I want to archieve is as follows: ids[type][id] = id; option.value = ids[type][id]; sorry, I have no idea, how to format code here – deppensido Jun 11 '20 at 21:30
It won't automatically create nested objects for you. You can do `ids[type] = ids[type] || {}; ids[type][id] = id;` – Barmar Jun 11 '20 at 21:31

1 Answers1