how to add to javascript objects? code example

Example 1: add property to object javascript

let yourObject = {};

//Examples:
//Example 1
let yourKeyVariable = "yourKey";
yourObject[yourKeyVariable] = "yourValue";

//Example 2
yourObject["yourKey"] = "yourValue";

//Example 3
yourObject.yourKey = "yourValue";

Example 2: js create object with properties

function Car(make, model, year) {
  this.make = make;
  this.model = model;
  this.year = year;
}