A simple function for namespacing things like events and class names

namespacer.js

// namespacer( "kf", [ "one", "two" ] );
// => { one: "one.kf", two: "two.kf" }
function namespacer( namespace, items, separator, before ) {
    var i, item,
        l = items.length,
        namespaced = {};
    
    if ( l && namespace ) {
        if ( !separator ) {
            separator = ".";
        }

        for ( i = 0; i < l; i++ ) {
            item = items[ i ];
            namespaced[ item ] = before ?
                namespace + separator + item :
                item + separator + namespace;
        }
    }
    
    return namespaced;
}