Reduce

my reduce

function(keys, values) {  
    var sumObj = {"qty_cross_ccy": 0,
                  "qty_base_ccy": 0,
                  "fees": 0,
                  "profit_loss_realized": 0,
                  "realized_pl_percentage": 0,
                  "average_buy_rate" : 0,
                  "average_sell_rate" : 0,
		  "asset_under_management" : 0};

    if(keys != null){
	sumObj.strategy = keys[0][0];
    }else{
	sumObj.strategy = values[0].strategy;
    }

    var total_aum = 0;
    var total_pl = 0;
    values.forEach(function(e,a){
    		total_aum += Number(e.asset_under_management);
		total_pl += Number(e.profit_loss_realized);       
		       
	});
    sumObj.asset_under_management = total_aum;
    sumObj.realized_pl_percentage = total_pl/total_aum;

    values.forEach(function(e,a){
                       sumObj.qty_cross_ccy += Number(e.qty_cross_ccy);
		       sumObj.qty_base_ccy += Number(e.qty_base_ccy);
		       sumObj.fees += Number(e.fees);
		       sumObj.profit_loss_realized += Number(e.profit_loss_realized);
		       sumObj.average_buy_rate += Number(e.average_buy_rate);
		       sumObj.average_sell_rate += Number(e.average_sell_rate);
  		   });
    sumObj.average_buy_rate = sumObj.average_buy_rate/values.length;
    sumObj.average_sell_rate = sumObj.average_sell_rate/values.length;
    return sumObj;
}