Multi-line String Concatenation In ES5

gistfile1.js

function messageUser( prefix, firstName, lastName ) {
  var message = 'I hope you can read my mind and understand how terrible \
              concatenating strings are in the current version of \
              JavaScript ' + prefix + ' ' + firstName + ' \
              ' + lastName + '. There nothing fun about it. Just a \
              whole lot of pain and yawn mode';
  return message;
}

messageUser( 'Prof.', 'Charles', 'Xavier' );