code: function() {
  
        // asinh(c) = log(c + sqrt(c^2 + 1))
  
        var tmp = this['im'];
        this['im'] = -this['re'];
        this['re'] = tmp;
        var res = this['asin']();
  
        this['re'] = -this['im'];
        this['im'] = tmp;
        tmp = res['re'];
  
        res['re'] = -res['im'];
        res['im'] = tmp;
        return res;
      }
docs: Calculate the complex asinh
  
  @returns {Complex}