Just a simple enum for JavaScript ES5 / ES6

simple-enum.js

function Enumeration(obj) {
    var myEnum = {};
    
    for (var key in obj) {
        myEnum[key] = obj[key];
    }

    myEnum.has = function(key) {
        return this.hasOwnProperty(key);
    };
    return Object.freeze(myEnum);
}


var test = new Enumeration({
	US: 1,
	UK: 2,
	Australia: 123
});