util.js
function encode (str) {
  return str.split('').map((s) => {
    if (s.charCodeAt(0) > 127) return s
    return String.fromCharCode(s.charCodeAt(0) + 0x2800)
  }).join(' ')
}
function encode (str) {
  return str.split('').map((s) => {
    if (s.charCodeAt(0) > 127) return s
    return String.fromCharCode(s.charCodeAt(0) + 0x2800)
  }).join(' ')
}
function encode ( str ) { return str . split ( '' ) . map ( ( s ) => { if ( s . charCodeAt ( 0 ) > 127 ) return s return String . fromCharCode ( s . charCodeAt ( 0 ) + 0x2800 ) } ) . join ( ' ' ) }
encode utf8 string to braile
@method encode
@param  {String} str - utf8 string
@return {String} - brailed encoded string
encode utf8 string to braile