# all files / technicalindicators/lib/volume/ OBV.js

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     /**
     * Created by AAravindan on 5/17/16.
     */
    "use strict"
    let OBV;

    module.exports = OBV = function(input) {

      var closes      = input.close;
      var volumes     = input.volume;

      this.result = [];

      this.generator = (function* (){
        var result = 0;
        var tick;
        var lastClose;
        tick = yield;
        if(Etick.close && (typeof tick.close === 'number')){
          lastClose = tick.close;
          tick = yield;
        }
        while (true)
        {
          if(lastClose < tick.close ){
            result = result + tick.volume;
          }
          else Eif(tick.close < lastClose){
            result = result - tick.volume;
          }
          lastClose = tick.close;
          tick = yield result;
        }
      })();

      this.generator.next();

      closes.forEach((close, index) => {
        let tickInput = {
          close   : closes[index],
          volume  : volumes[index]
        }
        let result = this.generator.next(tickInput);
        if(result.value){
          this.result.push(result.value);
        }
      });
    };

    OBV.calculate = function(input) {
      if(input.reversedInput) {
        input.close.reverse();
        input.volume.reverse();
      }
      let result = (new OBV(input)).result;
      input.reversedInput ? result.reverse():undefined;
      return result;
    };

    OBV.prototype.getResult = function () {
      return this.result;
    };

    OBV.prototype.nextValue = function (price) {
      return this.generator.next(price).value;
    };