How to initialize a hashmap of static values with integer keys in Javascript?

dictionary, initialization, integer, javascript, key

Solution

This strikes me as cleaner than using String or integer keys, though, unless you need to add additional properties on `xxx`:

var xxx = [
    ["a1","a2","a3"],
    ["b1","b2","b3"],
    ["c1","c2","c3"]
    //...
];

Just make `xxx` into an array containing arrays. You can get at, say, "b3", via `xxx[1][2]` (because `xxx[1] == ["b1", "b2", "b3"]`.)

Problem

Initializing a map having string keys can be performed as following in Javascript: ``` var xxx = { "aaa" : ["a1","a2","a3"], "bbb" : ["b1","b2","b3"], "ccc" : ["c1","c2","c3"], ... }; ``` I need to initialize some map with integer keys, something like: ``` var xxx = { 0 : ["a1","a2","a3"], 1 : ["b1","b2","b3"], 2 : ["c1","c2","c3"], ... }; ``` Of course, I could proceed with an array like this: ``` xxx[0]=["a1","a2","a3"]; xxx[1]=["b1","b2","b3"]; xxx[2]=["c1","c2","c3"]; ... ``` but the issue is that it makes the initialization code long. I need to squeeze all the bytes I can from it, because I need to push this object on the user side and any saved byte counts. The `xxx` object needs to be initialized with n arrays, and each entry has a unique associated id between 0 and n-1. So, there is a one to one mapping between the id I can use and the arrays, and these ids are consecutive from 0 to n-1, which makes me think I could use an array instead of a Javascript 'map'. I have noticed that one can push objects into an array. May be I could use something like this: ``` var xxx = []; xxx.push(["a1","a2","a3"],["b1","b2","b3"],["c1","c2","c3"],...); ``` Is this a proper to achieve my objective or is there something smarter in Javascript? Thanks. P.S.: Later, `xxx` will be referenced with something like `xxx[2]`, `xxx[10]`, etc...

Original source