JavaScript concat string with backspace

Question

I have a function f similar to

function f(str){
    alert(\"abc\"+str);
}

Now, I want to use JavaScript special charecter \"\\b\" in such a

Answer 1

Something like this:

function f(str, abc){
   if(!abc) abc = "abc";
   if (str.indexOf("\b") != "undefined")
   {
       abc = abc.slice(0,-1);
       str = str.replace("\b","");
       f(str, abc);
   }
   else alert(abc+str);
}

and as an added bonus you get to use recursion!

note that this is a little slower than doing it this way:

function f(str){
    var count = 0;
    var abc = "abc";
    for(var i = 0; i < str.length; i++)
    { 
       if(str[i] = "\b") //at least i think its treated as one character...
       count++;
    }
    abc = abc.slice(0, count * -1);
    alert(abc+str);
}