I am currently pulling data from excel which I then push into an object of array. I am doing so unsing lodash. My code looks like the following :

  Output = [];
_.forEachRight(data, element => {

    obj = { 
    MyDate: element.Date,
    Cost: element.Cost,
   
    }
    
    Output.push(obj);


});
data = Output;

This takes 27000 milliesseconds for a excel dataset with over 200k entries. My question : Is there a faster way of doing the above. I dont need to use arryas so every other data structure is welcomed.