nice solution

Use spoiler flag next time please.

As an example:
You can have 10 instances of "Apple"
You cannot have "Apple" instances of 10

Basically * is a method, which has to take in a number. It cannot perform it's function with a string.

Thank you, phaul, for the explanation, that is very interesting!

Thanks, approved!

He is gone, forked.

Feel like updateing/resubmitting? Description was changed in the meantime...

Previous translation didn't reverse words in place, but instead trimmed spaces.

Better, but still different.

What about this?

for(var i=0;i<len;i++) {
        switch(Math.floor(Math.random() * 10))
        {
          case 0: text += oldValue; break;
          case 1: text += " "; break;
          default: text += String.fromCharCode(Math.floor(Math.random() * 26) + 97);          
        }
      }

And the random-values are also different.
-> Math.floor(Math.random() * 7) -1; gives a result from -1 to 5 and not from 1 to 6