reverse string, like a paragraph

reverseString.js

/* input
---------- Ice and Fire ------------
fire, in end will world the say Some
  ice. in say Some                  
  desire of tasted I've what From       
  fire. favor who those with hold I     
                                    
  ... elided paragraph last ...         
                                        
 Frost Robert -----------------------  
*/

function reverseString(s) {
  return s.split('\n').map(function(line) {
    return line.split(/\s/).reverse().join(' ');
  }).join('\n');
}