title: How to add some symbol to every word in string?
body: <p>I am looking for fast and good way to add "-" before every word in string. For example "bla bla bla" should become "-bla -bla -bla".
  I don't want to make an array of this string, then map it, etc. It looks like a wrong and slow way.
  Do you have any suggestions on this?</p>