javascript message queue

Question

I am using javascript to create a message queue, say for example I want to store the messages "hello" and "word" to user with id "123", I am using the following to set and retrieve them.

var messages = [];
var userId = 123;

messages[userId].push("hello");
messages[userId].push("word");

needless to say, this is not working, damn arrays! How can I make this work, keeping it as simple as possible?

Thanks in advance

@laser_wizard: that's not quite what I want to do. I want to then be able to access the message list of a particular userId — john smith, Oct 19 '12 at 15:56
@Diodeus: I know, I'm just getting crazy litterally! trying to get assoc arrays working for me has always been a pain and this evening I really am offline! — john smith, Oct 19 '12 at 15:57

SLaks · Answer 1 · 2012-10-19T16:06:53.530

2

messages[userId] does not exist.

You need to put an array there:

messages[userId] = [];

edited Oct 19 '12 at 16:06

answered Oct 19 '12 at 15:53

SLaks

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score 2 · Accepted Answer · answered Oct 19 '12 at 15:59

2

You need an array ([]) for every user:

var messages = {};
var userId = 123; 
messages[userId] = ["hello", "word"];

You can use push too:

var messages = {};
var userId = 123; 
messages[userId] = [];
messages[userId].push("hello");
messages[userId].push("word");

answered Oct 19 '12 at 15:59

bfavaretto

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Thank you. This works. What about *getting* a particular userId's message queue? – john smith Oct 19 '12 at 16:06
@johnsmith: `messages[userId]` – SLaks Oct 19 '12 at 16:07
The `userId` is a property of the `messages` object, you can just do `messages[userId]`, or `messages[123]`. – bfavaretto Oct 19 '12 at 16:07

score 0 · Answer 3 · answered Oct 19 '12 at 16:02

0

well, technically you could push elements as properties of an object, which you have created and then iterate thorugh its properties.

answered Oct 19 '12 at 16:02

SzymonK

98
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javascript message queue

3 Answers3