difference between Function and new Function

Question

I sometimes see people doing this Function(\'alert(\"hi\")\') and sometimes they do new Function(\'alert(\"hi\")\')

Is there a difference b

Answer 1

There is only one usage of new Function. It is this:

var constructor = new Function;

// then this 

constructor.prototype = { 
    //...  stuff
};

// OR

constructor.prototype = new someOtherThing;

// then

var obj = new constructor;

Basically you can use new Function if you want to create an object constructor with an empty constructor that only uses inheritance.

If you want a function to do anything then don't use Function at all.