# problem-12.10

problem-12.10 E.10 (p. 408) This is easier to do with regular expressions, but if you don't know these you can split by " " and then throw out words of length 0. This can be done using the String class methods. For example:

    String$defineMethod("strip",function() {
      lengthx = function(x) {
        x = String$new(x)
        if(x$length() > 0)
          TRUE
        else
          FALSE
      }
      y = split(" ")
      aword = sapply(y, lengthx)
      words = y[aword]
      ## join with a space
      paste(words,collapse=" ")
    })

This would have been easier if the output of split() were a vector of type String, but this isn't possible. Instead, the function sapply() is used to apply the function lengthx(), which calculates the length of the string to each element in the output of split().