Javascript multi dimensional array issue

Question

I want to create an array like this:

send[1]['conversation_group_id']=1;

But i get an error that cannot set property conversation_group_id of undefined. What am i doing wrong?

Thanks!

If you want to add a property to an Object, you need to first create that Object. Here, as the error tells you, send[1] is not an Object, it is not defined. — blex
– blex, Commented Aug 13, 2017 at 17:07
You've initialized the array, but not an object. send[1] would have to point to the second element in an array that is an object, but currently it's nothing. If you first did send[1] = {} and then send[1]['conversation_group_id'] = 1 - it would work. — Christopher Messer
– Christopher Messer, Commented Aug 13, 2017 at 17:10

Dij · Accepted Answer · 2017-08-13 17:12:52Z

5

Even though you have initialized send with [], which makes it an array, send[1] will be undefined, you will need to initialize it as an object too before you can set a property inside it. At the moment you are trying to set a property of undefined.

var send = [];
console.log(send[1]);
send[1] = {};
send[1]['conversation_group_id']=1;
console.log(send[1]['conversation_group_id']);

answered Aug 13, 2017 at 17:12

Dij

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Lazar Ljubenović · Accepted Answer · 2017-08-13 17:15:44Z

1

Your data structure is an array of objects. To initialize it, you can also do it this way.

send = [null, {conversation_group_id: 1}]

Nothing wrong with @Dij's answer, but just though it's worth mentioning an alternative on how to initialize the structure you're looking for.

answered Aug 13, 2017 at 17:15

Lazar Ljubenović

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