Could somebody explain why the following functions give different results. The first does not seem to work, but the second does. I'm puzzled because I thought +=1 and ++ did the same thing. 

(I'm not intending to actually use this code, it's just to demonstrate the difference).

```
/*function 1*/
function incrementIfZero1(base,element) {

    if (element == 0) {
        return base++;
    }
    else
    {
        return base;
    }
};

/*function 2*/
function incrementIfZero2(base,element) {

    if (element == 0) {
        return base+=1;
    }
    else
    {
        return base;
    }
};

incrementIfZero1(1,0) /* -> 1*/
incrementIfZero2(1,0) /* -> 2*/

```

Any help is very much appreciated.

Thanks,

Robin

[Edit:] 

Thank you for your replies, it makes sense now. I had also tried the following statement, which resulted in the same thing as function 1:

```
return (base++)

```

I'm now surprised that this doesn't give the same result as function 2 - I would have expected the brackets to 'force' it to be evaluated before returning. Any idea why this is not the case?