code: function Converter(srcAlphabet, dstAlphabet) {
      if (!srcAlphabet || !dstAlphabet || !srcAlphabet.length || !dstAlphabet.length) {
          throw new Error('Bad alphabet');
      }
      this.srcAlphabet = srcAlphabet;
      this.dstAlphabet = dstAlphabet;
  }
docs: Converter
  
  @param {string|Array} srcAlphabet
  @param {string|Array} dstAlphabet
  @constructor