I am trying to make `if`condition for a large number of chars. 

I can use 

```
if (str==!||str==@||str==#||str==$||str==^||str==&)

```

And so on, but this seems very inefficient. I would like to get the condition to work if the char is on of those: 

```
!@#%$^&()_-+=\?/.,'][{}<>`~

```

Is there is any shorter and more efficient way of doing it?

```
for (var c0 = 1; c0 > fn.length++; c0++) {
 var str = fn.charAt(c0--);

 if (str ==-"!@#%$^&()_-+=\?/.,'][{}<>`~") {

 }
}

```

I want the check to accrue on every single char from the string above.