code: function random( width, set ) {
    width = parseInt( width ) || 4
    set   = set || RANDOM_SET
  
    ass.isString( set, "Random character set must be string" )
  
    var
      i = 0,
      r = ''
  
    for ( ; i < width; i ++ )
      r += RANDOM_SET[ Math.floor( Math.random() * RANDOM_SET.length ) ]
  
    return r
  }
docs: Produces a string of random character of a certain width.
  Uses the character set RANDOM_SET.