Simple function for joining non-Array object properties

join.js

// join( { one: "one", two: "two" } );
// => "one,two"
function join( obj, separator ) {
    var k,
        items = [];

    if ( typeof obj.join === "function" ) {
        items = obj;

    } else {
        for ( k in obj ) {
            if ( obj.hasOwnProperty( k ) ) {
                items.push( obj[ k ] );
            }
        }
    }

    return items.join( separator );
}