How to iterate through object properties in javascript

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JavaSE6

Hi,

I am trying to learn javascript, and I have the code below. I need to perform calculations with some of my object properties, -find a sum and find the biggest area, for example-. I don't know if I should create an array with my objects (and I don't know how to do this) and then iterate through them. I don't know if this will be the best approach.

class Park{
constructor(name, buildYear, area, noOfTrees){
this.name = name;
this.buildYear = buildYear;
this.area = area;
this.noOfTrees = noOfTrees;
}

const prk1 = new Park('Park1', 1980, 80, 1200);
const prk2 = new Park('Park2', 1972, 180, 2200);
const prk3 = new Park('Park3', 1990, 120, 1600);

Thank you very much for your help.
Andrea

What I have tried:

I have not tried anything yet and I don't know where to start.