A function that changes the value of a variable?

Question

JavaScript

Here I have a money variable and its value is 0. How to make the function increase it by 1 when it is executed

Answer 1

var a = 0;
function func(newA) {
   return newA+1;
}
a = func(a);

or shove it into an object

var a = { a: 1 };
function func(newA) {
    newA.a += 1;
}
func(a);

Answer 2

function(){
var money = 0;
money += 1;
}