Compress condition as logical expression

Hi,

I wonder if it's possible to shrink an expression like

``` js
if (!a)
c = b;
else
c =a;
```

to

``` js
c = a || b;
```

instead of

``` js
c = a ? a : b;
```

You do such tricks already in a logical manner to kick out if-statements, but it would make sense within expressions as well. Or do I miss something, that it should be avoided?

Thanks!