Iterating over Lua table in javascript with lua.vm.js

Question

A while ago I posted a THIS question, regarding interaction between lua.vm.js and javascript.

Now I have a slightly different problem:

Lets assume that I have the following code in the REPL

model = {}
model['test1'] = 1
model['test3'] = 2
model['test4'] = 3
model['test5'] = 4
model['test6'] = 5
local window = js.global
window.model = model

Because I'm using lua.vm.js, I now that from javascript I can get all the values by doing

window.model.get('test1')
window.model.get('test2')
window.model.get('test3')

But the problem with that is that I have to know beforehand that the entries at the table are "test1", "test2", etc.

Is there a way in javascript(or maybe by adding some more Lua code) that I can iterate all over the table without knowing all the entries?

Thanks in advance!

@EtanReisner: no, Lua tables are not directly represented as JavaScript objects. — Qantas 94 Heavy
– Qantas 94 Heavy, Commented Jun 24, 2014 at 13:14
In Lua you can use pairs to iterate over all of the table entries. I can't find anything for lua.vm.js though; there's very little documentation for it. — Colonel Thirty Two
– Colonel Thirty Two, Commented Jun 24, 2014 at 15:32
Have you looked at moonshine? I bring it up only because lua.vm.js doesn't seem to be actively developed anymore whereas the developer behind moonshine is still very active. — greatwolf
– greatwolf, Commented Jun 24, 2014 at 22:54

catwell · Accepted Answer · 2014-06-24 21:56:05Z

1

I think the easiest way to get the list of keys in model would be to use Lua directly.

From what I can see the lua.vm.js table object does not support iteration, but you can do that from JavaScript:

my_keys = L.execute('local r = {}; for k in pairs(model) do r[#r+1] = k end; return unpack(r)')

Then you can loop like this:

for (var i in my_keys) {
    console.log(my_keys[i], window.model.get(my_keys[i]));
}

answered Jun 24, 2014 at 21:56

catwell

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