Nested hash map in javascript

Question

I'm trying to create a nested hash map in js like in the example below:

let rooms = {};

rooms[roomNum][personName] = somethings

the problem is that when I try to do that I recive this error:

TypeError: Cannot set property 'personName' of undefined

I'm able to create just a "one level hash map" like that rooms[roomNum] = somethings

MauriceNino · Accepted Answer · 2020-07-23 10:37:19Z

2

That's not a hashmap, it's an object
rooms[roomNum] is not defined so you can't add something to rooms[roomNum][personName]

Here is an example on how you can do what you want to do:

let rooms = {};
rooms[roomNum] = {};
rooms[roomNum][personName] = somethings;

answered Jul 23, 2020 at 10:37

MauriceNino

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