Are eval() and new Function() the same thing?

Question

Are these two functions doing the same thing behind the scenes? (in single statement functions)

var evaluate = function(string) {
    return eval(\'(\' + str         


        

Answer 1

No.

In your update, the calls to evaluate and func produce the same result. But, they are most definitely not "doing the same thing behind the scenes". The func function creates a new function, but then immediately executes it, whereas the evaluate function simply executes the code on the spot.

From the original question:

var evaluate = function(string) {
    return eval(string);
}
var func = function(string) {
    return (new Function( 'return (' + string + ')' )());
}

These will give you very different results:

evaluate('0) + (4');
func('0) + (4');