Question

160

JavaScript enumerator?

rated 0 times [ 162] [ 2] / answers: 1 / hits: 16418 / 13 Years ago, tue, june 14, 2011, 12:00:00

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.

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jonrened

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answered 13 Years ago jeffery · Accepted Answer

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 );