javascript - How can one determinate if a function will return sub-functions without execution -

it context of one-page application development, need transform string executable function.

var repo = {}; 

i used strings in 2 formats :

repo.toto = "function toto(){\     alert('hello, toto');\ }";  repo.titi = "function titi(){\     this.sub1 = function() {};\     this.sub2 = function() {};\     this.sub3 = function() {};\ }"; 

i want know if function once executed give, or not, object of sub-functions.

below full case illustrate problem. eval not solution.

var createfunc = function(name) {     var string = repo[name];     var func = function("return new "+string+"");     repo[name] = func; };  typeof repo.toto; //string typeof repo.titi; //string  createfunc('toto'); createfunc('titi');  typeof repo.toto; //function typeof repo.titi; //function  repo['toto'](); //alert('hello, toto'); //object {}  repo['titi'](); //object { sub1: anonymous/titi/this.sub1(), sub2: anonymous/titi/this.sub2(), sub3: anonymous/titi/this.sub3() } 

do know way determinate if function give empty object (like in "toto" example) or not (like "titi" example), without having execute function?

i agree it's not possible every scenario.

but 2 sample inputs, main difference 1 has properties , other not.

note return new you're instantiating functions strings , returning new instance. code directly inside function executed (like constructor) , result object of properties , methods. so... that's why first 1 returns empty object.

you tell if return empty object or not if there isn't this.(something)=. might not best solution, don't see use of this.