Understanding references of AMD's define

JavaScript

var code = {};

code.klass = function(){

    var func = function(){
        console.log("hi");
    };
    
    return func;

};

var define = function(asset, callback){
    // TODO
    var klassFunc = code[asset];
    callback(klassFunc());
 };

(function(){
    
    define("klass", function(klass){
        // TODO: print "hi" to console using the `func` function without accessing `code` object
        
        klass()
    });

})();