lib/type/zset.js
function zincrby(increment, member) {
  var score = parseFloat(this._data[member]) || 0;
  score += parseFloat(increment);
  this.setKey(member, score);
  return score;
}
function zincrby(increment, member) {
  var score = parseFloat(this._data[member]) || 0;
  score += parseFloat(increment);
  this.setKey(member, score);
  return score;
}
function zincrby ( increment , member ) { var score = parseFloat ( this . _data [ member ] ) || 0 ; score += parseFloat ( increment ) ; this . setKey ( member , score ) ; return score ; }
Increments the score of member by increment.
Increments the score of member by increment .