JavaScript enumerator?

Question

I want to define a list of constants that have continuous integer value, for example:

var config.type = {"RED": 0, "BLUE" : 1, "YELLO" : 2};  

But it's boring to add a "XX" : y every time I need to add a new element in it.
So I'm wondering is there something like enumerator in C so I can just write:
var config.type = {"RED", "BLUE", "YELLO"} and they are given unique integer value automatically.

Answer 1

You could also try to do something like this:

function Enum(values){
    for( var i = 0; i < values.length; ++i ){
        this[values[i]] = i;
    }
    return this;
}
var config = {};
config.type = new Enum(["RED","GREEN","BLUE"]);
// check it: alert( config.type.RED );

or even using the arguments parameter, you can do away with the array altogether:

function Enum(){
    for( var i = 0; i < arguments.length; ++i ){
        this[arguments[i]] = i;
    }
    return this;
}
var config = {};
config.type = new Enum("RED","GREEN","BLUE");
// check it: alert( config.type.RED );

Answer 2

Just use an array:

var config.type =  ["RED", "BLUE", "YELLO"];

config.type[0]; //"RED"