I'am new in javascript. I can't understand why the function returns T1 object (not just string 'hi') in the following example.

 function T1(){
    return 'hi';
 }
 function T(){
    return new T1();
}
T();

output: T1

And returns function in the following example

 function T1(){
    return function(){ return 'hi'; }
 }
 function T(){
    return new T1();
}
T();

output: function (){ return 'hi' }

Please explain this rethult. Thank you)